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A204256
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Permanent of the n-th principal submatrix of A204255.
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2
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1, 3, 19, 86, 1060, 13276, 215308, 3086544, 68937280, 1552257216, 40750688448, 987692033664, 31883024335104, 1036810188322560, 37597332892066560, 1285416947916933120, 54309158991453634560, 2309262618253981040640, 106842526312699253145600
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OFFSET
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0,2
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LINKS
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MATHEMATICA
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f[i_, j_] := 1 + Mod[i + j, 4];
m[n_] := Table[f[i, j], {i, 1, n}, {j, 1, n}]
TableForm[m[8]] (* 8x8 principal submatrix *)
Flatten[Table[f[i, n + 1 - i],
{n, 1, 12}, {i, 1, n}]] (* A204255 *)
Join[{1}, Table[Permanent[m[n]], {n, 1, 20}]] (* A204256 *)
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PROG
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(PARI) a(n) = matpermanent(matrix(n, n, i, j, 1 + ((i+j) % 4))); \\ Michel Marcus, Jan 30 2021
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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