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 A258874 E.g.f.: exp( Sum_{n>=1} x^(4*n) / n^4 )  =  Sum_{n>=0} a(n) * x^(4*n) / (4*n)!. 3
 1, 24, 22680, 115684800, 1906520616000, 80659993905114624, 7746053047976698430976, 1560262733456599283808153600, 616206470499428864091871431168000, 445310234257659546728524999957770240000, 549601486893233034601458951894087488929628160 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,2 COMMENTS Sum_{n>=0} a(n)/(4*n)! = exp( Pi^4/90 ) = 2.95152868285335573659431343... LINKS Vaclav Kotesovec, Table of n, a(n) for n = 0..112 EXAMPLE E.g.f.: A(x) = 1 + 24*x^4/4! + 22680*x^8/8! + 115684800*x^12/12! + 1906520616000*x^16/16! +... where log(A(x)) = x^4 + x^8/2^4 + x^12/3^4 + x^16/4^4 + x^20/5^4 + x^24/6^4 +... or, log(A(x)) = 24*x^4/4! + 2520*x^8/8! + 5913600*x^12/12! + 81729648000*x^16/16! + 3892643213082624*x^20/20! +... MATHEMATICA nmax=20; k=4; Table[(CoefficientList[Series[Exp[PolyLog[k, x^k]], {x, 0, k*nmax}], x] * Range[0, k*nmax]!)[[k*n-k+1]], {n, 1, nmax+1}] (* Vaclav Kotesovec, Jun 21 2015 *) PROG (PARI) {a(n) = (4*n)!*polcoeff( exp(sum(m=1, n, (x^m/m)^4)+x*O(x^(4*n))), 4*n)} for(n=0, 20, print1(a(n), ", ")) CROSSREFS Cf. A226837, A258873. Sequence in context: A111404 A167066 A166338 * A188961 A153303 A272095 Adjacent sequences:  A258871 A258872 A258873 * A258875 A258876 A258877 KEYWORD nonn AUTHOR Paul D. Hanna, Jun 13 2015 STATUS approved

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Last modified November 30 06:28 EST 2021. Contains 349419 sequences. (Running on oeis4.)