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A275541
(n)! + (n + 1)!!/(n + 1) - 2
0
0, 0, 1, 6, 25, 126, 733, 5086, 40423, 363262, 3629743, 39920638, 479011993, 6227066878, 87178426333, 1307675013118, 20922791915023, 355687438417918, 6402373740187423, 121645100594626558, 2432902008831369073
OFFSET
0,4
CROSSREFS
Sequence in context: A099359 A073967 A188207 * A082430 A136593 A012293
KEYWORD
nonn,easy
AUTHOR
Olivier Gérard, Aug 01 2016
STATUS
approved