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A027140 a(n) = Sum_{k=0..n} T(n,k) * T(n,n+k), with T given by A027113. 0
1, 3, 12, 57, 264, 1261, 6141, 30276, 150853, 758145, 3836896, 19534086, 99957904, 513756551, 2650822585, 13724435509, 71275344341, 371177285715, 1937791196448, 10139548682524, 53165765660928, 279301910804937 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

LINKS

Table of n, a(n) for n=0..21.

CROSSREFS

Sequence in context: A334773 A192525 A106570 * A110309 A263667 A101106

Adjacent sequences:  A027137 A027138 A027139 * A027141 A027142 A027143

KEYWORD

nonn

AUTHOR

Clark Kimberling

STATUS

approved

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Last modified August 12 23:52 EDT 2022. Contains 356077 sequences. (Running on oeis4.)