A281967 - OEIS

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A281967

Number of sets of exactly n positive integers <= n+4 having a square element sum.

1, 2, 3, 5, 8, 13, 19, 25, 34, 47, 58, 70, 92, 113, 130, 156, 194, 218, 246, 299, 343, 373, 430, 508, 543, 596, 701, 765, 813, 920, 1047, 1090, 1181, 1365, 1436, 1509, 1697, 1865, 1915, 2068, 2349, 2411, 2522, 2832, 3017, 3076, 3331, 3705, 3743, 3918, 4389

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OFFSET

0,2

LINKS

Alois P. Heinz, Table of n, a(n) for n = 0..1000

FORMULA

a(n) = A281871(n+4,n).

EXAMPLE

a(2) = 3: {1,3}, {3,6}, {4,5}.

a(3) = 5: {1,2,6}, {1,3,5}, {2,3,4}, {3,6,7}, {4,5,7}.

a(4) = 8: {1,2,5,8}, {1,2,6,7}, {1,3,4,8}, {1,3,5,7}, {1,4,5,6}, {2,3,4,7}, {2,3,5,6}, {4,6,7,8}.

CROSSREFS