A143354 - OEIS

A143354

Triangle read by rows, (A051731)^4 * A128407, 1<=k<=n.

1, 4, -1, 4, 0, -1, 10, -4, 0, 0, 4, 0, 0, 0, -1, 16, -4, -4, 0, 0, 1, 4, 0, 0, 0, 0, 0, -1, 20, -10, 0, 0, 0, 0, 0, 0, 10, 0, -4, 0, 0, 0, 0, 0, 0, 16, -4, 0, 0, -4, 0, 0, 0, 0, 1, 4, 0, 0, 0, 0, 0, 0, 0, 0, 0, 40, -16, -10, 0, 0, 4, 0, 0, 0, 0, 0, 0, 4, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, -1

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OFFSET

1,2

COMMENTS

Left border = A007426.

Right border = mu(n), A008683.

Row sums = A007425: (1, 3, 3, 6, 3, 9,...).

LINKS

Table of n, a(n) for n=1..90.

FORMULA

Triangle read by rows, (A051731)^4 * A128407, 1<=k<=n

EXAMPLE