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A026997 a(n) = Sum_{k=0..n-1} T(n,k) * T(n,k+1), with T given by A026703. 0
1, 6, 35, 168, 926, 4294, 23224, 106690, 571926, 2617886, 13965688, 63815684, 339452265, 1549699466, 8228066295, 37543939462, 199095075169, 908167940082, 4812012405883, 21945589904716, 116213845733553, 529936445158768, 2805163046954295, 12790521159853090, 67685654170211481 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Table of n, a(n) for n=1..25.

CROSSREFS

Sequence in context: A026987 A030532 A333800 * A014337 A002041 A103995

Adjacent sequences: A026994 A026995 A026996 * A026998 A026999 A027000

KEYWORD

nonn

AUTHOR

Clark Kimberling

EXTENSIONS

More terms from Sean A. Irvine, Oct 21 2019

STATUS

approved

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Last modified February 2 06:48 EST 2023. Contains 360000 sequences. (Running on oeis4.)