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A062765
a(n) = n*(n-1)*(n-3)*(n-5).
0
0, 0, 6, 0, -12, 0, 90, 336, 840, 1728, 3150, 5280, 8316, 12480, 18018, 25200, 34320, 45696, 59670, 76608, 96900, 120960, 149226, 182160, 220248, 264000, 313950, 370656, 434700, 506688, 587250, 677040, 776736, 887040, 1008678, 1142400, 1288980, 1449216, 1623930, 1813968, 2020200, 2243520
OFFSET
0,3
FORMULA
G.f.: 6*x^2*(1 - 5*x + 8*x^2)/(1 - x)^5. - Andrew Howroyd, Sep 18 2024
PROG
(PARI) a(n)=n*(n-1)*(n-3)*(n-5)
CROSSREFS
Sequence in context: A028651 A028635 A028619 * A137946 A256856 A028603
KEYWORD
sign,easy
AUTHOR
Jason Earls, Jul 16 2001
STATUS
approved