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 A187991 Number of nondecreasing arrangements of 7 numbers x(i) in -(n+5)..(n+5) with the sum of sign(x(i))*2^|x(i)| zero. 1
 411, 632, 912, 1257, 1673, 2166, 2742, 3407, 4167, 5028, 5996, 7077, 8277, 9602, 11058, 12651, 14387, 16272, 18312, 20513, 22881, 25422, 28142, 31047, 34143, 37436, 40932, 44637, 48557, 52698 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Row 7 of A187988. LINKS Table of n, a(n) for n=1..30. EXAMPLE Some solutions for n=3: -7 -8 -7 -1 -6 -8 -8 -7 -4 -6 -7 -5 -8 -7 -8 -6 -4 -5 -2 -1 -3 -5 -6 -5 -2 -3 -5 -3 -3 -7 -3 -5 -4 -1 -2 -1 -1 2 -1 -3 -2 -3 4 1 -2 -7 -3 -4 -4 0 1 -1 1 2 0 3 -2 2 4 1 -2 6 4 4 4 0 1 1 2 3 0 5 -1 2 5 1 3 6 6 5 5 5 2 1 2 4 6 6 -1 3 5 1 3 7 6 5 7 8 7 2 6 8 8 6 5 6 6 5 8 7 7 5 CROSSREFS Sequence in context: A146075 A374270 A212710 * A090123 A055018 A201844 Adjacent sequences: A187988 A187989 A187990 * A187992 A187993 A187994 KEYWORD nonn AUTHOR R. H. Hardin, Mar 18 2011 EXTENSIONS a(26) corrected by R. J. Mathar, May 11 2023 STATUS approved

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Last modified August 14 12:13 EDT 2024. Contains 375164 sequences. (Running on oeis4.)