A027136 - OEIS

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A027136

a(n) = Sum_{k=0..n-1} T(n,k) * T(n,2n-k), with T given by A027113.

0

2, 7, 30, 131, 538, 2153, 8441, 32484, 123292, 462673, 1719899, 6343170, 23237876, 84641287, 306758202, 1106900323, 3978716442, 14252356483, 50897604269, 181263039820, 643928439234, 2282348057593, 8072881497390

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OFFSET

1,1

LINKS

Table of n, a(n) for n=1..23.

CROSSREFS

Sequence in context: A325577 A097924 A375444 * A353288 A299296 A116363

Adjacent sequences: A027133 A027134 A027135 * A027137 A027138 A027139

KEYWORD

nonn

AUTHOR

Clark Kimberling

STATUS

approved