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 A144133 Gegenbauer polynomial C_n^2(3). 0
 1, 12, 106, 828, 6051, 42408, 288788, 1925736, 12637733, 81897876, 525360702, 3341936196, 21109664455, 132544828560, 827948567080, 5148653356944, 31891223012553, 196848686563164, 1211273655997202, 7432579805359884 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,2 LINKS Wikipedia, Gegenbauer polynomials FORMULA G.f.: 1 / (1 - 6*x + x^2)^2. a(-4 - n) = -a(n). Convolution square of A001109. - Michael Somos, May 11 2012 EXAMPLE 1 + 12*x + 106*x^2 + 828*x^3 + 6051*x^4 + 42408*x^5 + ... MATHEMATICA lst={}; Do[AppendTo[lst, GegenbauerC[n, 2, 3]], {n, 0, 8^3}]; lst PROG {a(n) = local(s=1); if( n<0, n = -4 - n; s=-1); s * polcoeff( 1 / (1 - 6*x + x^2)^2 + x * O(x^n), n)} /* Michael Somos, May 11 2012 */ CROSSREFS Cf. A001109. Sequence in context: A016223 A027142 A090816 * A089396 A218111 A166755 Adjacent sequences:  A144130 A144131 A144132 * A144134 A144135 A144136 KEYWORD nonn AUTHOR Vladimir Joseph Stephan Orlovsky, Sep 11 2008 STATUS approved

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