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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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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; refs; listen; history; internal format)
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OFFSET
| 1,1
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COMMENTS
| Triangle can be used in matrix inverses. Signs in columns as in A153881.
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EXAMPLE
| 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
| (Excel cell formula) =if(row()>=column(); if(row()>=column(); 1; "")*if(row()>column(); -1; 1); "")
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CROSSREFS
| Sequence in context: A160357 A057077 A070748 * A156734 A010555 A108784
Adjacent sequences: A154987 A154988 A154989 * A154991 A154992 A154993
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KEYWORD
| sign,tabl
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AUTHOR
| Mats Granvik (mats.granvik(AT)abo.fi), Jan 18 2009
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