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Search: id:A154990
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| A154990 |
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Triangle read by rows. Main diagonal is positive. The rest of the terms are negative. |
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+0
8
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| 1, -1, 1, -1, -1, 1, -1, -1, -1, 1, -1, -1, -1, -1, 1, -1, -1, -1, -1, -1, 1, -1, -1, -1, -1, -1, -1, 1, -1, -1, -1, -1, -1, -1, -1, 1, -1, -1, -1, -1, -1, -1, -1, -1, 1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 1, -1, -1, -1, -1, -1, -1, -1
(list; table; graph; listen)
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OFFSET
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1,1
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COMMENT
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Triangle can be used in matrix inverses. Signs in columns as in A153881.
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EXAMPLE
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Table begins:
1;
-1,1;
-1,-1,1;
-1,-1,-1,1;
-1,-1,-1,-1,1;
-1,-1,-1,-1,-1,1;
-1,-1,-1,-1,-1,-1,1;
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MAPLE
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(Excel cell formula) =if(row()>=column(); if(row()>=column(); 1; "")*if(row()>column(); -1; 1); "")
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CROSSREFS
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Sequence in context: A153881 A160357 A070748 this_sequence A156734 A108784 A010555
Adjacent sequences: A154987 A154988 A154989 this_sequence A154991 A154992 A154993
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KEYWORD
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sign,tabl
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AUTHOR
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Mats Granvik (mats.granvik(AT)abo.fi), Jan 18 2009
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