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A085372
If n = 0 or 1 then a(n) = 1; if n = 2, 3 or 4 then a(n) = 0; otherwise a(n) = (n+1)*a(n-1)-(n-2)*a(n-2)-(n-5)*a(n-3)+(n-3)*a(n-4).
1
1, 1, 0, 0, 0, 2, 14, 102, 828, 7522, 75706, 836622, 10073824, 131300266, 1841921270, 27673138086, 443343106468, 7544813993618, 135925854199186, 2584491212811038, 51722014716352136, 1086739983701035418, 23919225571408768782, 550360567615450589302
OFFSET
0,6
COMMENTS
This is the same recurrence as A002464 but with different initial values.
MAPLE
A085372 := proc(n) options remember; if n <= 1 then 1 elif n <= 4 then 0 else (n+1)*A085372(n-1)-(n-2)*A085372(n-2)-(n-5)*A085372(n-3)+(n-3)*A085372(n-4); fi; end;
CROSSREFS
Cf. A002464.
Sequence in context: A144277 A037726 A037621 * A123525 A286310 A295865
KEYWORD
nonn,easy
AUTHOR
N. J. A. Sloane, Aug 14 2003
STATUS
approved