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A143319

Triangle read by rows, A051731 * A143318; 1<=k<=n.

1, 3, -1, 4, -1, -1, 7, -4, 0, 0, 6, -1, -1, -1, -1, 12, -8, -3, 1, 1, 1, 8, -1, -1, -1, -1, -1, -1, 15, -11, 0, 0, 0, 0, 0, 0, 13, -5, -5, 0, 0, 0, 0, 0, 0, 18, -10, -3, -3, -3, 1, 1, 1, 1, 1, 12, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 28, -27, -7, 4, 4, 4, 0, 0, 0, 0, 0, 0

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OFFSET

1,2

COMMENTS

Left border = sigma(n), A000203.

Right border = mu(n) A008683.

Row sums = d(n), A000005.

LINKS

Table of n, a(n) for n=1..78.

EXAMPLE

First few rows of the triangle =

3, -1;