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A026661 T(2n,n-1), T given by A026659. 0
1, 5, 20, 87, 358, 1533, 6445, 27555, 117529, 503001, 2167209, 9289047, 40320051, 173069913, 755481768, 3247042719, 14236984102, 61259521341, 269560841080, 1161017915091, 5123885956516, 22087793150253, 97719510829418 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

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

CROSSREFS

Sequence in context: A152187 A045499 A145932 * A099014 A219672 A011966

Adjacent sequences:  A026658 A026659 A026660 * A026662 A026663 A026664

KEYWORD

nonn

AUTHOR

Clark Kimberling

STATUS

approved

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Last modified June 5 18:48 EDT 2020. Contains 334854 sequences. (Running on oeis4.)