A281972 Number of sets of exactly n positive integers <= n+9 having a square element sum.

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

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

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

Adjacent sequences: A281969 A281970 A281971 * A281973 A281974 A281975

Keyword

nonn

Author

Alois P. Heinz, Feb 03 2017

Status

approved