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A026576 T(2n,n-2), T given by A026568. 0
1, 3, 18, 65, 346, 1288, 6818, 25518, 136152, 510532, 2745347, 10309234, 55784794, 209766714, 1140670242, 4294635438, 23445204441 (list; graph; refs; listen; history; text; internal format)
OFFSET

2,2

LINKS

Table of n, a(n) for n=2..18.

CROSSREFS

Sequence in context: A317404 A110689 A027333 * A048899 A107583 A157535

Adjacent sequences:  A026573 A026574 A026575 * A026577 A026578 A026579

KEYWORD

nonn

AUTHOR

Clark Kimberling

STATUS

approved

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Last modified February 29 01:30 EST 2020. Contains 332353 sequences. (Running on oeis4.)