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 A246606 Central terms of the triangle A116853. 2
 1, 4, 78, 3216, 229080, 25022880, 3884393520, 812752093440, 220448163358080, 75225258805132800, 31537353006189676800, 15933924342019634227200, 9548252826112300306406400, 6695627848564821490753228800, 5431772705577464891946292992000 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 COMMENTS a(n) = A116853(2*n,n). LINKS Reinhard Zumkeller, Table of n, a(n) for n = 1..200 FORMULA a(n) = (2*n - 1)!*hypergeom([1 - n], [1 - 2*n], -1). - Peter Luschny, Nov 04 2018 Conjecture: D-finite with recurrence +(-2*n+3)*a(n) +4*(n-1)*(2*n^2-4*n+1)*a(n-1) +(n-1)*(n-2)*(2*n-1)*a(n-2)=0. - R. J. Mathar, Jul 01 2022 MAPLE a := n -> (2*n - 1)!*hypergeom([1 - n], [1 - 2*n], -1): seq(simplify(a(n)), n=1..15); # Peter Luschny, Nov 04 2018 PROG (Haskell) a246606 n = a116853 (2 * n - 1) n CROSSREFS Sequence in context: A279437 A296997 A220240 * A210903 A054951 A215843 Adjacent sequences:  A246603 A246604 A246605 * A246607 A246608 A246609 KEYWORD nonn,changed AUTHOR Reinhard Zumkeller, Aug 31 2014 STATUS approved

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Last modified July 6 22:19 EDT 2022. Contains 355115 sequences. (Running on oeis4.)