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A026639 T(2n,n-1), T given by A026637. 0
1, 5, 20, 74, 278, 1049, 3980, 15170, 58052, 222914, 858512, 3314960, 12829070, 49748705, 193259660, 751954250, 2929965020, 11431262390, 44651369720, 174597927740, 683388447260, 2677230376490, 10496941482680, 41188078562324 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Table of n, a(n) for n=1..24.

CROSSREFS

Sequence in context: A273718 A094806 A289596 * A248326 A022633 A092490

Adjacent sequences:  A026636 A026637 A026638 * A026640 A026641 A026642

KEYWORD

nonn

AUTHOR

Clark Kimberling

STATUS

approved

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Last modified August 13 02:05 EDT 2020. Contains 336441 sequences. (Running on oeis4.)