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 A015089 Carlitz-Riordan q-Catalan numbers (recurrence version) for q=6. 23
 1, 1, 7, 265, 57799, 75025897, 583552122727, 27227375795690569, 7621977131953256556295, 12802009986716861649949951657, 129014790439200398432389878440405671 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,3 LINKS Seiichi Manyama, Table of n, a(n) for n = 0..51 Robin Sulzgruber, The Symmetry of the q,t-Catalan Numbers, Thesis, University of Vienna, 2013. FORMULA a(n+1) = Sum_{i=0..n} q^i*a(i)*a(n-i) with q=6 and a(0)=1. G.f. satisfies: A(x) = 1 / (1 - x*A(6*x)) = 1/(1-x/(1-6*x/(1-6^2*x/(1-6^3*x/(1-...))))) (continued fraction). - Seiichi Manyama, Dec 26 2016 EXAMPLE G.f. = 1 + x + 7*x^2 + 265*x^3 + 57799*x^4 + 75025897*x^5 + 583552122727*x^6 + ... MATHEMATICA a[n_] := a[n] = Sum[6^i*a[i]*a[n -i -1], {i, 0, n -1}]; a[0] = 1; Array[a, 16, 0] (* Robert G. Wilson v, Dec 24 2016 *) m = 11; ContinuedFractionK[If[i == 1, 1, -6^(i - 2) x], 1, {i, 1, m}] + O[x]^m // CoefficientList[#, x]& (* Jean-François Alcover, Nov 17 2019 *) PROG (Ruby) def A(q, n)   ary = [1]   (1..n).each{|i| ary << (0..i - 1).inject(0){|s, j| s + q ** j * ary[j] * ary[i - 1 - j]}}   ary end def A015089(n)   A(6, n) end # Seiichi Manyama, Dec 24 2016 CROSSREFS Cf. A227543. Cf. A015108 (q=-11), A015107 (q=-10), A015106 (q=-9), A015105 (q=-8), A015103 (q=-7), A015102 (q=-6), A015100 (q=-5), A015099 (q=-4), A015098 (q=-3), A015097 (q=-2), A090192 (q=-1), A000108 (q=1), A015083 (q=2), A015084 (q=3), A015085 (q=4), A015086 (q=5), this sequence (q=6), A015091 (q=7), A015092 (q=8), A015093 (q=9), A015095 (q=10), A015096 (q=11). Column k=6 of A090182, A290759. Sequence in context: A290880 A231486 A048291 * A179565 A069449 A100465 Adjacent sequences:  A015086 A015087 A015088 * A015090 A015091 A015092 KEYWORD nonn AUTHOR EXTENSIONS Offset changed to 0 by Seiichi Manyama, Dec 24 2016 STATUS approved

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Last modified April 19 16:51 EDT 2021. Contains 343116 sequences. (Running on oeis4.)