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A192559
a(n) = sum(stirling1(n,k)^2*k!, k=0..n).
1
1, 1, 3, 28, 518, 15446, 669422, 39529008, 3040944216, 294858211992, 35128012184232, 5038597437006816, 855820352688929520, 169777212251996740080, 38880302912575002130800, 10176193922326946712143616, 3017694882032205124404127104
OFFSET
0,3
LINKS
MATHEMATICA
Table[Sum[StirlingS1[n, k]^2k!, {k, 0, n}], {n, 0, 100}]
PROG
(Maxima) makelist(sum(stirling1(n, k)^2*k!, k, 0, n), n, 0, 24);
CROSSREFS
Sequence in context: A355473 A180710 A005328 * A161971 A156315 A248571
KEYWORD
nonn
AUTHOR
Emanuele Munarini, Jul 04 2011
STATUS
approved