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 A316081 Sequence shifts left nine places under Weigh transform with a(n) = signum(n) for n<9. 3
 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 2, 2, 3, 4, 5, 6, 8, 10, 12, 16, 20, 26, 35, 45, 59, 79, 104, 137, 183, 242, 320, 427, 567, 754, 1008, 1345, 1797, 2409, 3228, 4328, 5817, 7817, 10511, 14154, 19063, 25689, 34655, 46768, 63148, 85336, 115372, 156057, 211233 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,13 LINKS Alois P. Heinz, Table of n, a(n) for n = 0..2500 FORMULA G.f.: x + x^2 + x^3 + x^4 + x^5 + x^6 + x^7 + x^8 + x^9 * Product_{n>=1} (1 + x^n)^a(n). - Ilya Gutkovskiy, May 09 2019 MAPLE b:= proc(n, i) option remember; `if`(n=0, 1, `if`(i<1, 0,       add(binomial(a(i), j)*b(n-i*j, i-1), j=0..n/i)))     end: a:= n-> (k-> `if`(n

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Last modified March 30 22:55 EDT 2020. Contains 333132 sequences. (Running on oeis4.)