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 A113685 Triangular array read by rows: T(n,k) is the number of partitions of n in which sum of odd parts is k, for k=0,1,...n; n>=0. 6
 1, 0, 1, 1, 0, 1, 0, 1, 0, 2, 2, 0, 1, 0, 2, 0, 2, 0, 2, 0, 3, 3, 0, 2, 0, 2, 0, 4, 0, 3, 0, 4, 0, 3, 0, 5, 5, 0, 3, 0, 4, 0, 4, 0, 6, 0, 5, 0, 6, 0, 6, 0, 5, 0, 8, 7, 0, 5, 0, 6, 0, 8, 0, 6, 0, 10, 0, 7, 0, 10, 0, 9, 0, 10, 0, 8, 0, 12, 11, 0, 7, 0, 10, 0, 12, 0, 12, 0, 10, 0, 15, 0, 11, 0, 14, 0, 15, 0 (list; table; graph; refs; listen; history; text; internal format)
 OFFSET 0,10 COMMENTS (Sum over row n) = A000041(n) = number of partitions of n. Reversal of this array is array in A113686, except for row 0. From Gary W. Adamson, Apr 11 2010: (Start) Let M = an infinite lower triangular matrix with A000041 interleaved with zeros: (1, 0, 1, 0, 2, 0, 3, 0, 5,...) and Q = A000009 diagonalized with the rest zeros. Then A113685 = M*Q. That row sums of the triangle (deleting prefaced zeros) = A000041 is equivalent to the identity: p(x) = p(x^2) * A000009(x). (End) LINKS FORMULA G.f.: G(t,x) = 1/product((1-t^(2j-1)x^(2j-1))(1-x^(2j)), j=1..infinity). - Emeric Deutsch, Feb 17 2006 EXAMPLE First 5 rows: 1 0 1 1 0 1 0 1 0 2 2 0 1 0 2 0 2 0 2 0 3. The partitions of 5 are 5, 1+4, 2+3, 1+1+3, 1+2+2, 1+1+1+2, 1+1+1+1+1. The sums of odd parts are 5,1,3,5,1,3,5, respectively, so that the numbers of 0's, 1's, 2s, 3s, 4s, 5s are 0,2,0,2,0,3, which is row 5 of the array. MAPLE g := 1/product((1-t^(2*j-1)*x^(2*j-1))*(1-x^(2*j)), j=1..20): gser := simplify(series(g, x=0, 22)): P[0] := 1: for n from 1 to 14 do P[n] := coeff(gser, x^n) od: for n from 0 to 14 do seq(coeff(P[n], t, j), j=0..n) od; # yields sequence in triangular form - Emeric Deutsch, Feb 17 2006 CROSSREFS Cf. A000041, A113686, A066967. Sequence in context: A204423 A112170 A259976 * A049825 A287443 A039651 Adjacent sequences:  A113682 A113683 A113684 * A113686 A113687 A113688 KEYWORD nonn,tabl AUTHOR Clark Kimberling, Nov 05 2005 EXTENSIONS More terms from Emeric Deutsch, Feb 17 2006 STATUS approved

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Last modified October 21 03:24 EDT 2019. Contains 328291 sequences. (Running on oeis4.)