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A368852
a(n) = (n!)^3 * Sum_{k=0..n} (-1)^k/(k!)^3.
0
1, 0, 1, 26, 1665, 208124, 44954785, 15419491254, 7894779522049, 5755294271573720, 5755294271573720001, 7660296675464621321330, 13236992655202865643258241, 29081672863480695818238355476, 79800110337391029325246047426145
OFFSET
0,4
FORMULA
a(n) = n^3 * a(n-1) + (-1)^n.
PROG
(PARI) a(n) = n!^3*sum(k=0, n, (-1)^k/k!^3);
CROSSREFS
Cf. A217284.
Sequence in context: A042300 A282884 A080163 * A300578 A217228 A005644
KEYWORD
nonn,easy
AUTHOR
Seiichi Manyama, Jan 07 2024
STATUS
approved