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A074702
a(n) = ((n+1)^2*(n-1)*a(n-1)+(-1)^(n+1))/n.
1
1, 4, 43, 806, 23213, 947864, 51997111, 3685295242, 327581799289, 35673657942572, 4670006130663971, 723461783075360174, 130890931830249779173, 27346855400248614577216, 6534075316966068976316143, 1770326031190494313270654994, 539845302687736618823239734641
OFFSET
1,2
LINKS
FORMULA
a(n) = round((n+1)!^2*BesselJ(0, 2))/n.
MATHEMATICA
nxt[{n_, a_}]:={n+1, (n*a*(n+2)^2+(-1)^(n+2))/(n+1)}; Transpose[ NestList[ nxt, {1, 1}, 15]][[2]] (* Harvey P. Dale, Jun 26 2013 *)
CROSSREFS
Cf. A073701.
Sequence in context: A198205 A277639 A326432 * A197717 A277456 A377743
KEYWORD
easy,nonn
AUTHOR
Vladeta Jovovic, Sep 03 2002
EXTENSIONS
More terms from Emeric Deutsch, Dec 18 2003
More terms from Harvey P. Dale, Jun 26 2013
STATUS
approved