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A026972 a(n) = Sum_{k=0..n-1} T(n,k) * T(n,k+1), with T given by A026648. 0
1, 6, 24, 108, 406, 1908, 7289, 34248, 131766, 623700, 2416836, 11487528, 44745468, 213451560, 834897375, 3993910416, 15673923910, 75152083716, 295737641768, 1420670333640, 5603322265428, 26960309526744, 106539505068194, 513309625743600, 2031786103702780, 9800639852315208 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Table of n, a(n) for n=1..26.

CROSSREFS

Sequence in context: A122740 A034432 A026962 * A075484 A122739 A038380

Adjacent sequences:  A026969 A026970 A026971 * A026973 A026974 A026975

KEYWORD

nonn

AUTHOR

Clark Kimberling

EXTENSIONS

More terms from Sean A. Irvine, Oct 20 2019

STATUS

approved

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Last modified October 19 20:37 EDT 2021. Contains 348091 sequences. (Running on oeis4.)