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 A015103 Carlitz-Riordan q-Catalan numbers (recurrence version) for q=-7. 22
 1, 1, -6, -307, 104742, 251699498, -4229811552588, -497641562809372379, 409828230340907182689774, 2362579011761419853955236859806, -95338580221916838164306067991935130836 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,3 LINKS Seiichi Manyama, Table of n, a(n) for n = 0..49 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=-7, and a(0) = 1. G.f. satisfies: A(x) = 1 / (1 - x*A(-7*x)) = 1/(1-x/(1+7*x/(1-7^2*x/(1+7^3*x/(1-...))))) (continued fraction). - Seiichi Manyama, Dec 28 2016 EXAMPLE G.f. = 1 + x - 6*x^2 - 307*x^3 + 104742*x^4 + 251699498*x^5 + ... MATHEMATICA m = 11; ContinuedFractionK[If[i == 1, 1, -(-7)^(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 A015103(n) A(-7, n) end # Seiichi Manyama, Dec 25 2016 CROSSREFS Cf. A227543. Cf. A015108 (q=-11), A015107 (q=-10), A015106 (q=-9), A015105 (q=-8), this sequence (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), A015089 (q=6), A015091 (q=7), A015092 (q=8), A015093 (q=9), A015095 (q=10), A015096 (q=11). Column k=7 of A290789. Sequence in context: A333482 A104003 A280215 * A282373 A123181 A281932 Adjacent sequences: A015100 A015101 A015102 * A015104 A015105 A015106 KEYWORD sign AUTHOR EXTENSIONS Offset changed to 0 by Seiichi Manyama, Dec 25 2016 STATUS approved

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Last modified December 1 07:20 EST 2022. Contains 358454 sequences. (Running on oeis4.)