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A362279
Expansion of e.g.f. exp(x - 5*x^2/2).
2
1, 1, -4, -14, 46, 326, -824, -10604, 18236, 442396, -378224, -22498024, -1695704, 1348185736, 1458406496, -92914595024, -202295082224, 7230872519696, 24425954508736, -626352572263904, -2946818250593824, 59688438975796576, 369104355288148096
OFFSET
0,3
LINKS
FORMULA
a(n) = a(n-1) - 5*(n-1)*a(n-2) for n > 1.
a(n) = n! * Sum_{k=0..floor(n/2)} (-5/2)^k / (k! * (n-2*k)!).
PROG
(PARI) my(N=30, x='x+O('x^N)); Vec(serlaplace(exp(x-5*x^2/2)))
CROSSREFS
Column k=5 of A362277.
Cf. A115331.
Sequence in context: A297016 A258255 A124805 * A121530 A121299 A326346
KEYWORD
sign,easy
AUTHOR
Seiichi Manyama, Apr 13 2023
STATUS
approved