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A028402
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Number of types of Boolean functions of n variables under a certain group.
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3
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6, 20, 72, 272, 1056, 4160, 16512, 65792, 262656, 1049600, 4196352, 16781312, 67117056, 268451840, 1073774592, 4295032832, 17180000256, 68719738880, 274878431232, 1099512676352, 4398048608256, 17592190238720, 70368752566272, 281474993487872, 1125899940397056
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OFFSET
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2,1
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LINKS
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FORMULA
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a(n) = 6*a(n-1) - 8*a(n-2) for n > 3.
G.f.: x^2*(6 - 16*x)/((2*x - 1)*(4*x - 1)). (End)
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MATHEMATICA
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PROG
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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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