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A110525 Expansion of 1/(1-x^2*c(3x)), c(x) the g.f. A000108. 0
1, 0, 1, 3, 19, 141, 1180, 10593, 99712, 971067, 9702388, 98899638, 1024429861, 10752006033, 114097140757, 1222113460332, 13195550763793, 143470913825427, 1569448022488435, 17261100136608984, 190752895126918819 (list; graph; refs; listen; history; internal format)
OFFSET

0,4

COMMENTS

Diagonal sums of A110518.

FORMULA

a(n)=sum{k=0..floor(n/2), (k/(n-k))*C(2n-3k-1, n-2k)*3^(n-2k)}

CROSSREFS

Sequence in context: A027314 A025571 A082758 * A058859 A095002 A080833

Adjacent sequences:  A110522 A110523 A110524 * A110526 A110527 A110528

KEYWORD

easy,nonn

AUTHOR

Paul Barry (pbarry(AT)wit.ie), Jul 24 2005

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Last modified February 14 15:30 EST 2012. Contains 205632 sequences.