A292132 Main diagonal of A292131.

1, -1, -2, 6, 12, 45, -150, -203, -840, -1872, 6390, 8580, 30084, 69108, 165802, -494565, -514320, -1997296, -4202298, -10175526, -18908420, 49930440, 54032770, 190735688, 405256872, 948210600, 1751280726, 3624555168, -7676955468, -6724059944, -26741354430

Offset

0,3

Links

Seiichi Manyama, Table of n, a(n) for n = 0..1000

Formula

a(n) = [x^n] Product_{k=1..n} (1 - n*x^k).

Prog

(PARI) {a(n) = polcoeff(prod(k=1, n, 1-n*x^k+x*O(x^n)), n)}

Crossrefs

Cf. A124577, A291698, A292131.

Sequence in context: A180070 A177834 A169858 * A208147 A369330 A152873

Adjacent sequences: A292129 A292130 A292131 * A292133 A292134 A292135

Keyword

sign

Author

Seiichi Manyama, Sep 09 2017

Status

approved