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 A281870 Number of sets of exactly ten positive integers <= n having a square element sum. 2
 0, 1, 5, 16, 58, 171, 434, 1030, 2259, 4645, 9071, 16927, 30354, 52586, 88351, 144425, 230347, 359329, 549338, 824505, 1216843, 1768278, 2533124, 3581117, 5000891, 6904149, 9430598, 12753622, 17086885, 22692075, 29887626, 39058827, 50669397, 65274492, 83535475 (list; graph; refs; listen; history; text; internal format)
 OFFSET 10,3 LINKS Alois P. Heinz, Table of n, a(n) for n = 10..1000 EXAMPLE a(11) = 1: {1,3,4,5,6,7,8,9,10,11}. a(12) = 5: {1,2,3,4,5,7,9,10,11,12}, {1,2,3,4,6,7,8,10,11,12}, {1,2,3,5,6,7,8,9,11,12}, {1,2,4,5,6,7,8,9,10,12}, {1,3,4,5,6,7,8,9,10,11}. MAPLE b:= proc(n, i, t) option remember;       `if`(i(t+1)*(2*i-t)/2, 0,       `if`(i>n, 0, b(n-i, i-1, t-1))+b(n, i-1, t))))     end: a:= proc(n) option remember; `if`(n<0, 0, a(n-1)+add(        b(j^2-n, n-1, 9), j=isqrt(n-45)..isqrt(10*n-45)))     end: seq(a(n), n=10..60); CROSSREFS Column k=10 of A281871. Sequence in context: A057553 A226973 A006217 * A116914 A047103 A226897 Adjacent sequences:  A281867 A281868 A281869 * A281871 A281872 A281873 KEYWORD nonn AUTHOR Alois P. Heinz, Feb 01 2017 STATUS approved

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Last modified March 19 13:29 EDT 2019. Contains 321330 sequences. (Running on oeis4.)