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A071859
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Determinant of M_n where M_n is the n X n matrix m_(i,j) = A030300(i+j).
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0
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0, 0, -1, 1, 1, -1, 0, 0, 1, 1, -1, -1, 0, 0, -1, 1, 1, 1, -2, 2, 3, -3, -1, 1, -2, -2, 1, 1, 1, -1, 0, 0, 1, 1, -1, 1, 2, -2, -1, -1, 3, 3, -2, -2, -1, 1, -1, -1, 0, 0, 1, -1, -1, 1, 0, 0, 1, 1, -1, -1, 0, 0, -1, 1, 1, 1, -2, 2, 3, -3, -1, -1, 4, 4, -3, -3
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OFFSET
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1,19
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COMMENTS
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a(n)=0 for n=1,2,7,8,13,14,31,32,49,50,55,56,61,62...hence if a(n)=0, n odd it seems that a(n+1)=0. It seems also that if a(n)=0 (n odd ) then n == 1 mod 6 (converse doesn't hold).
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LINKS
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PROG
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(PARI) for(n=1, 70, print1(matdet(matrix(n, n, i, j, length(binary(j+i))%2)), ", "))
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CROSSREFS
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KEYWORD
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easy,sign
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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