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 A172010 2*A142458(2*n+1,n)/(n+2). 2
 1, 26, 2741, 683870, 315704418, 234725594388, 257237392999893, 390832857108454838, 787178784737043042806, 2031210797603911366282796 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,2 LINKS FORMULA a(n)=2*A142458(2*n+1,n)/(n+2) MATHEMATICA Clear[A] A[n_, 1] := 1; A[n_, n_] := 1; A[n_, k_] := (3*n -     3*k + 1)A[n - 1, k - 1] + (3*k - 2)A[n - 1, k]; a = Table[A[n, k], {n, 20}, {k, n}]; Table[2*a[[2*n + 2, n + 1]]/(n + 2), {n, 0, 9}] CROSSREFS Cf. A142458, A177042, A177043. Sequence in context: A177636 A232159 A263946 * A283571 A283041 A183068 Adjacent sequences:  A172007 A172008 A172009 * A172011 A172012 A172013 KEYWORD nonn AUTHOR Roger L. Bagula, Nov 19 2010 STATUS approved

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Last modified January 27 10:54 EST 2022. Contains 350607 sequences. (Running on oeis4.)