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A027986 Sum{T(n,k)*T(n,k+2)}, 0<=k<=2n-2, T given by A027960. 0
20, 100, 420, 1694, 6746, 26735, 105722, 417613, 1648692, 6507197, 25681362, 101359219, 400094756, 1579568360, 6237401648, 24635828774, 97327071806, 384596629610, 1520138671688, 6009885957464, 23765835521966, 94003008751940 (list; graph; refs; listen; history; text; internal format)
OFFSET

2,1

LINKS

Table of n, a(n) for n=2..23.

CROSSREFS

Sequence in context: A039455 A294112 A188050 * A240437 A174078 A239857

Adjacent sequences:  A027983 A027984 A027985 * A027987 A027988 A027989

KEYWORD

nonn

AUTHOR

Clark Kimberling

STATUS

approved

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Last modified March 1 02:43 EST 2021. Contains 341732 sequences. (Running on oeis4.)