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A292132 Main diagonal of A292131. 4
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 (list; graph; refs; listen; history; text; internal format)
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 A152873 A175810

Adjacent sequences:  A292129 A292130 A292131 * A292133 A292134 A292135

KEYWORD

sign

AUTHOR

Seiichi Manyama, Sep 09 2017

STATUS

approved

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Last modified June 24 02:56 EDT 2021. Contains 345415 sequences. (Running on oeis4.)