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A027317
a(n) = Sum_{k=0..m-2} T(n,k) * T(n,k+2), where m=n for n=0,1,2,3; m=2n for n >= 4; and T is given by A026082.
0
1, 6, 71, 561, 4797, 41462, 359530, 3124752, 27213084, 237432807, 2075064759, 18162872365, 159198909233, 1397157808149, 12275908402205, 107974903916703, 950639462501475, 8377212510209165, 73882962176311701, 652114141845864819, 5759883148706408695
OFFSET
2,2
CROSSREFS
Sequence in context: A050788 A241883 A297746 * A283342 A099339 A213530
KEYWORD
nonn
EXTENSIONS
More terms from Sean A. Irvine, Oct 27 2019
STATUS
approved