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 A283238 Expansion of exp( Sum_{n>=1} sigma_2(3*n)*x^n/n ) in powers of x. 4
 1, 10, 75, 447, 2335, 10977, 47667, 193775, 745819, 2738568, 9653342, 32821384, 108061167, 345622069, 1076767956, 3275039352, 9743874779, 28405248949, 81256123017, 228383836091, 631427595230, 1718990010867, 4612234492354, 12206598044861, 31889379237288 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,2 LINKS Seiichi Manyama, Table of n, a(n) for n = 0..1000 FORMULA a(n) = (1/n)*Sum_{k=1..n} sigma_2(3*k)*a(n-k). - Seiichi Manyama, Mar 04 2017 CROSSREFS Cf. exp( Sum_{n>=1} sigma_k(3*n)*x^n/n ): A182819 (k=1), this sequence (k=2). Cf. exp( Sum_{n>=1} sigma_2(m*n)*x^n/n ): A000219 (m=1), A283224 (m=2), this sequence (m=3). Sequence in context: A026979 A274251 A073379 * A316462 A022734 A027203 Adjacent sequences: A283235 A283236 A283237 * A283239 A283240 A283241 KEYWORD nonn AUTHOR Seiichi Manyama, Mar 03 2017 STATUS approved

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Last modified June 22 14:17 EDT 2024. Contains 373587 sequences. (Running on oeis4.)