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A192561
a(n) = Sum_{k=0..n} Stirling1(n+1,k+1)^2*k!.
0
1, 2, 15, 235, 6150, 239596, 12934838, 921199238, 83488967768, 9367741437936, 1273270076895432, 205977064267447848, 39082297497546456816, 8591243344831665290592, 2165102057150152483834032, 619866690597157598321655216, 200017218987010519451515954560
OFFSET
0,2
MATHEMATICA
Table[Sum[StirlingS1[n+1, k+1]^2k!, {k, 0, n}], {n, 0, 100}]
PROG
(Maxima) makelist(sum(stirling1(n+1, k+1)^2*k!, k, 0, n), n, 0, 24);
CROSSREFS
Sequence in context: A326095 A212370 A302358 * A356587 A227098 A180610
KEYWORD
nonn
AUTHOR
Emanuele Munarini, Jul 04 2011
STATUS
approved