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A026988 a(n) = Sum{T(n,k)*T(n,k+2)}, 0<=k<=n-2, T given by A026681. 0
1, 10, 69, 340, 1696, 8774, 44500, 203884, 998953, 5026154, 24474925, 110862660, 540493911, 2706193730, 13062307900, 59214077236, 288140818097 (list; graph; refs; listen; history; text; internal format)
OFFSET

2,2

LINKS

Table of n, a(n) for n=2..18.

CROSSREFS

Sequence in context: A219466 A321060 A026958 * A081280 A038806 A016273

Adjacent sequences:  A026985 A026986 A026987 * A026989 A026990 A026991

KEYWORD

nonn

AUTHOR

Clark Kimberling

STATUS

approved

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Last modified April 25 16:08 EDT 2019. Contains 322461 sequences. (Running on oeis4.)