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 A281966 Number of sets of exactly n positive integers <= n+3 having a square element sum. 2
 1, 2, 2, 3, 5, 6, 7, 10, 13, 14, 16, 21, 25, 24, 31, 37, 37, 40, 50, 55, 51, 64, 74, 69, 77, 92, 95, 89, 111, 122, 110, 127, 146, 145, 139, 171, 181, 161, 191, 213, 202, 203, 243, 250, 222, 270, 292, 264, 285, 328, 326, 296, 362, 381, 335, 383, 425, 407, 388 (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+3,n). EXAMPLE a(3) = 3: {1,2,6}, {1,3,5}, {2,3,4}. a(4) = 5: {1,2,6,7}, {1,3,5,7}, {1,4,5,6}, {2,3,4,7}, {2,3,5,6}. a(5) = 6: {1,2,3,4,6}, {1,3,6,7,8}, {1,4,5,7,8}, {2,3,5,7,8}, {2,4,5,6,8}, {3,4,5,6,7}. CROSSREFS A diagonal of A281871. Sequence in context: A218933 A266746 A096981 * A276431 A308272 A035541 Adjacent sequences: A281963 A281964 A281965 * A281967 A281968 A281969 KEYWORD nonn,look AUTHOR Alois P. Heinz, Feb 03 2017 STATUS approved

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Last modified March 29 14:39 EDT 2023. Contains 361599 sequences. (Running on oeis4.)