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A055555 n!*(n!+1)/2. 1
1, 1, 3, 21, 300, 7260, 259560, 12703320, 812871360, 65841128640, 6584096534400, 796675481078400, 114721266640780800, 19387894024929830400, 3800027228319587865600, 855006126362753549184000, 218881568348707987666944000, 63256773252773762936322048000 (list; graph; refs; listen; history; internal format)
OFFSET

0,3

MATHEMATICA

Table[n!*(n! + 1)/2, {n, 0, 20}] (* From Vladimir Joseph Stephan Orlovsky, Jul 07 2011 *)

CROSSREFS

Sequence in context: A000681 A171201 A193206 * A158888 A005329 A134528

Adjacent sequences:  A055552 A055553 A055554 * A055556 A055557 A055558

KEYWORD

nonn

AUTHOR

N. J. A. Sloane (njas(AT)research.att.com), Jul 19 2000

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Last modified February 16 14:37 EST 2012. Contains 205930 sequences.