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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
 1, 6, 35, 154, 613, 2882, 14995, 68730, 291606, 1378110, 7047087, 32801046, 143237183, 681449778, 3462931356, 16261134650, 72210836920, 345094694354, 1747534150303, 8253521588404, 37063741964059, 177681801860358, 897584067273979, 4256535683245074, 19269823577105032 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 LINKS CROSSREFS Sequence in context: A078799 A203288 A026957 * A030532 A333800 A026997 Adjacent sequences: A026984 A026985 A026986 * A026988 A026989 A026990 KEYWORD nonn AUTHOR EXTENSIONS More terms from Sean A. Irvine, Oct 20 2019 STATUS approved

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Last modified December 1 18:31 EST 2022. Contains 358475 sequences. (Running on oeis4.)