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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
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,19
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COMMENTS
| 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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PROG
| (PARI) for(n=1, 70, print1(matdet(matrix(n, n, i, j, length(binary(j+i))%2)), ", "))
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CROSSREFS
| Cf. A030300.
Sequence in context: A068460 A143797 A079729 * A135695 A105899 A071434
Adjacent sequences: A071856 A071857 A071858 * A071860 A071861 A071862
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KEYWORD
| easy,sign
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AUTHOR
| Benoit Cloitre (benoit7848c(AT)orange.fr), Jun 09 2002
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EXTENSIONS
| Name corrected by Nathaniel Johnston (nathaniel(AT)nathanieljohnston.com), Sep 26 2011
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