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A026987 a(n) = Sum_{k=0..n-1} T(n,k) * T(n,k+1), with T given by A026681. 0

%I

%S 1,6,35,154,613,2882,14995,68730,291606,1378110,7047087,32801046,

%T 143237183,681449778,3462931356,16261134650,72210836920,345094694354,

%U 1747534150303,8253521588404,37063741964059,177681801860358,897584067273979,4256535683245074,19269823577105032

%N a(n) = Sum_{k=0..n-1} T(n,k) * T(n,k+1), with T given by A026681.

%K nonn

%O 1,2

%A _Clark Kimberling_

%E More terms from _Sean A. Irvine_, Oct 20 2019

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Last modified January 28 17:08 EST 2023. Contains 359895 sequences. (Running on oeis4.)