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A281972
Number of sets of exactly n positive integers <= n+9 having a square element sum.
2
1, 3, 8, 26, 69, 166, 365, 750, 1446, 2646, 4645, 7856, 12852, 20411, 31626, 47910, 71022, 103342, 147982, 208554, 289572, 397140, 538319, 720965, 955716, 1255661, 1634233, 2108003, 2699453, 3431884, 4329465, 5426928, 6764353, 8377805, 10314695, 12640228
OFFSET
0,2
LINKS
FORMULA
a(n) = A281871(n+9,n).
EXAMPLE
a(1) = 3: {1}, {4}, {9}.
a(2) = 8: {1,3}, {1,8}, {2,7}, {3,6}, {4,5}, {5,11}, {6,10}, {7,9}.
CROSSREFS
A diagonal of A281871.
Sequence in context: A061812 A009452 A206141 * A355869 A343553 A317852
KEYWORD
nonn
AUTHOR
Alois P. Heinz, Feb 03 2017
STATUS
approved