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Search: id:A144221
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| 1, -1, -1, 1, 1, -1, -1, 5, -1, 1, 5, -11, 1, 1, 1, 9, -11, -11, 9, -1, -1, -9, -9, 51, -29, 1, 1, -1, -1, -57, 111, -29, -29, 13, -1, 1, -15, 113, -111, -111, 169, -55, 1, 1, 1, -31, 113, 113, -559, 449, -55, -55, 17, -1
(list; table; graph; listen)
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OFFSET
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0,8
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COMMENT
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Row sums = (1, 0, 1, 2, -3, -4, 5, 6, -7, -8,...).
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FORMULA
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Triangle read by rows, A118433 * A007318^(-1) * A000012.
A118433 = the self-inverse triangle. A007318^(-1) = the inverse of Pascal's triangle and A000012 = an infinite lower triangular matrix with all 1's.
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EXAMPLE
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First few rows of the triangle =
1;
1, -1;
-1, 1, 1;
-1, -1, 5, -1;
1, 5, -11, 1, 1;
1, 9, -11, -11, 9, -1;
-1, -9, -9, 51, -29, 1, 1
-1, -1, -57, 111, -29, -29, 13, -1;
1, -15, 113, -111, -111, 169, -55, 1, 1;
...
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CROSSREFS
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A118433
Sequence in context: A046607 A152717 A071856 this_sequence A159570 A028313 A050178
Adjacent sequences: A144218 A144219 A144220 this_sequence A144222 A144223 A144224
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KEYWORD
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tabl,sign
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AUTHOR
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Gary W. Adamson (qntmpkt(AT)yahoo.com), Sep 14 2008
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