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 A145093 Constant term in Atkin polynomial A_n(j). 3
 1, -720, 269280, -107765856, 44184000960, -18343724398560, 7674347243833920, -3227358183233849280, 1362313994259911121792, -576679534187816788835040, 244653763082978694519455040, -103977849310265945170768392000, 44255109760585207541022458448000, -18858872473375780341531310443030720 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,2 LINKS Seiichi Manyama, Table of n, a(n) for n = 0..379 M. Kaneko and D. Zagier, Supersingular j-invariants, hypergeometric series and Atkin's orthogonal polynomials, pp. 97-126 of D. A. Buell and J. T. Teitelbaum, eds., Computational Perspectives on Number Theory, Amer. Math. Soc., 1998 FORMULA Theorem 4 on page 100 and Proposition 6 on page 117 of the Kaneko-Zagier reference gives an explicit formula and a recurrence for these polynomials. See Maple code. From Vaclav Kotesovec, Apr 07 2018: (Start) For n > 0, a(n) = (-1)^n * 2^(4*n + 1) * 3^(3*n) * Gamma(2*n - 1/6) / (Gamma(5/6) * Gamma(2*n)). a(n) ~ (-1)^n * 2^(4*n + 5/6) * 3^(3*n) / (Gamma(5/6) * n^(1/6)). (End) MAPLE af:=proc(a, n) mul(a+i, i=0..n-1); end; A0:=n->(-12)^(3*n+1)*af(-1/12, n)*af(5/12, n)/(2*n-1)!; MATHEMATICA Flatten[{1, Table[FullSimplify[(-1)^n * 2^(4*n + 1) * 3^(3*n) * Gamma[2*n - 1/6] / (Gamma[5/6] * Gamma[2*n])], {n, 1, 20}]}] (* Vaclav Kotesovec, Apr 07 2018 *) CROSSREFS Sequence in context: A239184 A003439 A222158 * A221621 A054779 A030185 Adjacent sequences:  A145090 A145091 A145092 * A145094 A145095 A145096 KEYWORD sign AUTHOR N. J. A. Sloane, Feb 28 2009 STATUS approved

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Last modified June 17 06:06 EDT 2019. Contains 324183 sequences. (Running on oeis4.)