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A067000 a(1) = 1; a(n) = Sum (n+k)!a(k)/(2k)!, k = 1..n-1. 1
1, 3, 27, 339, 5553, 112761, 2736099, 77252175, 2488315257, 90053238033, 3617791773723, 159761716507215, 7692231450102849, 401057043646065345, 22510943881422758739, 1353385233080839510335, 86771327488839208390473 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Table of n, a(n) for n=1..17.

CROSSREFS

Cf. A007683.

Sequence in context: A217363 A234462 A153853 * A168593 A157089 A138436

Adjacent sequences:  A066997 A066998 A066999 * A067001 A067002 A067003

KEYWORD

nonn

AUTHOR

N. J. A. Sloane, Feb 16 2002

STATUS

approved

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Last modified March 23 21:31 EDT 2017. Contains 283985 sequences.