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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
CROSSREFS
Cf. A007683.
Sequence in context: A217363 A234462 A153853 * A354658 A307650 A168593
KEYWORD
nonn
AUTHOR
N. J. A. Sloane, Feb 16 2002
STATUS
approved

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Last modified March 28 18:04 EDT 2024. Contains 371254 sequences. (Running on oeis4.)