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 A338755 Central coefficients of number triangle A210590. 2
 1, 5, 119, 5205, 324569, 26519745, 2681170547, 323104570789, 45224035123553, 7211322045457101, 1290620989042420815, 256193650031596282005, 55863607060241676345961, 13273922770286234753307065, 3413846723448521483558054235, 944832714523233697801280445525, 280003865538498845896076940256065 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,2 LINKS Seiichi Manyama, Table of n, a(n) for n = 0..100 FORMULA a(n) = A210590(2*n, n) = (-1)^n * A234937(2*n, n). PROG (PARI) {a(n) = my(t='t); (2*n)!*polcoef(polcoef(prod(k=1, 2*n, (1-x^k+x*O(x^(2*n)))^(-1-t)), 2*n), n)} (PARI) {a(n) = my(t='t); if(n==0, 1, (2*n)!*polcoef(polcoef(exp(sum(k=1, 2*n, (1+t)*sigma(k)*(x^k+x*O(x^(2*n)))/k)), 2*n), n))} CROSSREFS Cf. A210590, A234937. Sequence in context: A156962 A065818 A139189 * A155202 A168599 A193328 Adjacent sequences:  A338752 A338753 A338754 * A338756 A338757 A338758 KEYWORD nonn AUTHOR Seiichi Manyama, Nov 07 2020 STATUS approved

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Last modified May 8 19:28 EDT 2021. Contains 343666 sequences. (Running on oeis4.)