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 A014231 (Product of 3 successive Catalan numbers)/2. 1
 1, 5, 70, 1470, 38808, 1189188, 40489020, 1491345570, 58388438680, 2400295633736, 102692368441936, 4542162450316400, 206643434552856000, 9631060074695610000, 458381806260954003000, 22220282755463598704250, 1094733022441519300455000, 54717445279576990999935000 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,2 LINKS Harvey P. Dale, Table of n, a(n) for n = 0..560 FORMULA a(n) = A014228(n)/2. MAPLE a:= proc(n) option remember; `if`(n=0, 1, 8*(2*n-1)*(2*n+1)*(2*n+3)*a(n-1)/((n+1)*(n+2)*(n+3))) end: seq(a(n), n=0..20); # Alois P. Heinz, Oct 20 2013 MATHEMATICA Times@@@Partition[CatalanNumber[Range[0, 20]], 3, 1]/2 (* Harvey P. Dale, Apr 10 2013 *) CROSSREFS Cf. A000108. Sequence in context: A151471 A077691 A277301 * A203528 A147629 A274256 Adjacent sequences: A014228 A014229 A014230 * A014232 A014233 A014234 KEYWORD nonn AUTHOR N. J. A. Sloane. STATUS approved

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Last modified June 23 03:57 EDT 2024. Contains 373629 sequences. (Running on oeis4.)