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 A172013 6*A142459(2*n+1,n)/(n+2). 0
 3, 118, 20343, 8530698, 6711481694, 8575821262764, 16243345162977759, 42826533033277249154, 150138953276380791799098, 675925071086215282939520628 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,1 LINKS FORMULA a(n)=6*A142459(2*n+1,n)/(n+2) MATHEMATICA A[n_, 1] := 1; A[n_, n_] := 1; A[n_, k_] := (4*n - 4*k + 1)A[n - 1, k - 1] + (4*k - 3)A[n - 1, k]; a = Table[A[n, k], {n, 20}, {k, n}]; Table[6*a[[2*n + 2, n + 1]]/(n + 2), {n, 0, 9}] CROSSREFS Sequence in context: A283883 A173053 A180393 * A143781 A114077 A176996 Adjacent sequences:  A172010 A172011 A172012 * A172014 A172015 A172016 KEYWORD nonn AUTHOR Roger L. Bagula, Nov 19 2010 STATUS approved

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Last modified December 1 22:12 EST 2021. Contains 349435 sequences. (Running on oeis4.)