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 A183946 Number of strings of numbers x(i=1..n) in 0..2 with sum i^2*x(i) equal to n^2*2 2
 1, 1, 2, 1, 5, 7, 10, 20, 37, 77, 118, 227, 385, 697, 1191, 2072, 3489, 5846, 9862, 16373, 26897, 44125, 71991, 116290, 187653, 300903, 478422, 761553, 1200692, 1893309, 2961406, 4630296, 7188253, 11155170, 17211745, 26490317, 40633554, 62126693 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,3 COMMENTS Column 2 of A183953 LINKS R. H. Hardin, Table of n, a(n) for n = 1..88 EXAMPLE All solutions for n=4 ..0 ..0 ..0 ..2 MATHEMATICA r [n_, k_, s_] := r[n, k, s] = Which[s < 0, 0, n == 0, If[s == 0, 1, 0], True, Sum[r[n - 1, k, s - c*n^2], {c, 0, k}]]; T[n_, k_] := r[n, k, k*n^2]; a[n_] := T[n, 2]; Table[a[n], {n, 1, 40}] (* Jean-François Alcover, Jul 22 2022, after R. J. Mathar in A183953 *) CROSSREFS Sequence in context: A105459 A227048 A139133 * A293719 A291377 A005297 Adjacent sequences: A183943 A183944 A183945 * A183947 A183948 A183949 KEYWORD nonn AUTHOR R. H. Hardin, Jan 08 2011 STATUS approved

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Last modified March 20 17:21 EDT 2023. Contains 361386 sequences. (Running on oeis4.)