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A047069 T(2n,n), array T as in A047060. 0
1, 2, 9, 50, 292, 1757, 10809, 67473, 425711, 2707757, 17332058, 111508304, 720429774, 4670990039, 30375989547, 198050065342, 1294186149138, 8473767434587, 55579644024480, 365116858320540, 2401901294047629, 15820713708790749, 104326220133691996 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

LINKS

Table of n, a(n) for n=0..22.

CROSSREFS

Sequence in context: A274066 A055997 A115599 * A225006 A211789 A192945

Adjacent sequences:  A047066 A047067 A047068 * A047070 A047071 A047072

KEYWORD

nonn

AUTHOR

Clark Kimberling

EXTENSIONS

Data corrected by Sean A. Irvine, May 11 2021

STATUS

approved

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Last modified October 23 17:37 EDT 2021. Contains 348215 sequences. (Running on oeis4.)