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A192694
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Number of 1X7 integer matrices with each row summing to zero, row elements in nondecreasing order, rows in lexicographically nondecreasing order, and the sum of squares of the elements <= 2*n^2 (number of collections of 1 zero-sum 7-vectors with total modulus squared not more than 2*n^2, ignoring vector and component permutations)
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1
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2, 9, 36, 110, 277, 634, 1304, 2492, 4430, 7559, 12260, 19272, 29251, 43339, 62515, 88501, 122666, 167322, 224735, 297919, 389439, 504010, 644682, 817003, 1025762, 1278054, 1578938, 1938210, 2360862, 2859571, 3441853, 4122058, 4907573, 5817118
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OFFSET
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1,1
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COMMENTS
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LINKS
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EXAMPLE
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Some solutions for 1X7 <= 2*4^2
.-2.-2.-2..0..1..1..4...-2.-2.-1..0..1..2..2...-2.-2..0..1..1..1..1
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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STATUS
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approved
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