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 A152977 Square array A(n,k), n>=0, k>=0, read by antidiagonals: A(n,k) is the number of partitions of 2^n into powers of 2 less than or equal to 2^k. 13
 1, 1, 1, 1, 2, 1, 1, 2, 3, 1, 1, 2, 4, 5, 1, 1, 2, 4, 9, 9, 1, 1, 2, 4, 10, 25, 17, 1, 1, 2, 4, 10, 35, 81, 33, 1, 1, 2, 4, 10, 36, 165, 289, 65, 1, 1, 2, 4, 10, 36, 201, 969, 1089, 129, 1, 1, 2, 4, 10, 36, 202, 1625, 6545, 4225, 257, 1, 1, 2, 4, 10, 36, 202, 1827, 17361, 47905, 16641, 513, 1 (list; table; graph; refs; listen; history; text; internal format)
 OFFSET 0,5 COMMENTS Column sequences converge towards A002577. LINKS Alois P. Heinz, Antidiagonals n = 0..140, flattened FORMULA A(n,k) = [x^2^(n-1)] 1/(1-x) * 1/Product_{j=0..k-1} (1-x^(2^j)) for n>0; A(0,k) = 1. EXAMPLE A(3,2) = 9, because there are 9 partitions of 2^3=8 into powers of 2 less than or equal to 2^2=4: [4,4], [4,2,2], [4,2,1,1], [4,1,1,1,1], [2,2,2,2], [2,2,2,1,1], [2,2,1,1,1,1], [2,1,1,1,1,1,1], [1,1,1,1,1,1,1,1]. Square array A(n,k) begins:   1,  1,  1,   1,   1,   1,  ...   1,  2,  2,   2,   2,   2,  ...   1,  3,  4,   4,   4,   4,  ...   1,  5,  9,  10,  10,  10,  ...   1,  9, 25,  35,  36,  36,  ...   1, 17, 81, 165, 201, 202,  ... MAPLE b:= proc(n, j) local nn, r;       if n<0 then 0     elif j=0 then 1     elif j=1 then n+1     elif n `if`(n=0, 1, b(2^(n-k), k)): seq(seq(A(n, d-n), n=0..d), d=0..11); MATHEMATICA b[n_, j_] := Module[{nn, r}, Which[n < 0, 0, j == 0, 1, j == 1, n+1, n < j, b[n, j] = b[n-1, j]+b[2*n, j-1], True, nn = 1+Floor[n]; r := n-nn; (nn-j)*Binomial[nn, j]*Sum[Binomial[j, h]/(nn-j+h)*b[j-h+r, j]*(-1)^h, {h, 0, j-1}]]]; a[n_, k_] := If[n == 0, 1, b[2^(n-k), k]]; Table[Table[a[n, d-n], {n, 0, d}], {d, 0, 11}] // Flatten (* Jean-François Alcover, Dec 18 2013, translated from Maple *) CROSSREFS Columns k=0-10 give: A000012, A094373, A028400(n-2) for n>1, A210772, A210773, A210774, A210775, A210776, A210777, A210778, A210779. Cf. A002577, A000123, A181322, A145515. Main diagonal and lower diagonals give: A002577, A125792, A125794. Sequence in context: A199711 A048887 A047913 * A259799 A208447 A320750 Adjacent sequences:  A152974 A152975 A152976 * A152978 A152979 A152980 KEYWORD nonn,tabl AUTHOR Alois P. Heinz, Jan 26 2011 STATUS approved

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Last modified December 12 15:11 EST 2019. Contains 329960 sequences. (Running on oeis4.)