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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 (list; graph; refs; listen; history; text; internal format)
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 * A317852 A148801 A131910

Adjacent sequences:  A281969 A281970 A281971 * A281973 A281974 A281975

KEYWORD

nonn

AUTHOR

Alois P. Heinz, Feb 03 2017

STATUS

approved

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Last modified February 19 10:24 EST 2019. Contains 320310 sequences. (Running on oeis4.)