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A030851
a(n) = floor(exp(1/21) * n!).
0
1, 2, 6, 25, 125, 755, 5285, 42286, 380578, 3805780, 41863584, 502363009, 6530719126, 91430067771, 1371451016567, 21943216265073, 373034676506249, 6714624177112491, 127577859365137340, 2551557187302746813
OFFSET
1,2
MATHEMATICA
Floor[Exp[1/21] Range[20]!] (* Harvey P. Dale, Jan 22 2015 *)
CROSSREFS
Cf. A021025 (1/21).
Sequence in context: A030806 A030828 A030839 * A188687 A030859 A030877
KEYWORD
nonn,easy
AUTHOR
STATUS
approved