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1, -1, 1, 1, -1, 1, 0, 1, -1, 1, 1, 0, 1, -1, 1, 0, 1, 0, 1, -1, 1, 2, 0, 1, 0, 1, -1, 1, 0, 2, 0, 1, 0, 1, -1, 1, 3, 0, 2, 0, 1, 0, 1, -1, 1, 1, 3, 0, 2, 0, 1, 0, 1, -1, 1, 4, 1, 3, 0, 2, 0, 1, 0, 1, -1, 1, 2, 4, 1, 3, 0, 2, 0, 1, 0, 1, -1, 1
(list; table; graph; refs; listen; history; internal format)
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OFFSET
| 0,22
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COMMENTS
| Row sums = A002865, (1, 0, 1, 1, 2, 2, 4, 4, 7, 8,...).
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FORMULA
| A000012^(-2) * A027293. A000012^(-1) is the pairwise difference operator,
and A027293 = a triangle with A000041 in every column.
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EXAMPLE
| First few rows of the triangle =
1;
-1, 1;
1, -1, 1;
0, 1, -1, 1;
1, 0, 1, -1, 1;
0, 1, 0, 1, -1, 1;
2, 0, 1, 0, 1, -1, 1;
0, 2, 0, 1, 0, 1, -1, 1;
3, 0, 2, 0, 1, 0, 1, -1, 1;
1, 3, 0, 2, 0, 1, 0, 1, -1, 1;
4, 1, 3, 0, 2, 0, 1, 0, 1, -1, 1;
2, 4, 1, 3, 0, 2, 0, 1, 0, 1, -1, 1;
...
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CROSSREFS
| A027293, Cf. A002865
Sequence in context: A136745 A090465 A052344 * A167746 A050370 A050374
Adjacent sequences: A147765 A147766 A147767 * A147769 A147770 A147771
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KEYWORD
| tabl,sign
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AUTHOR
| Gary W. Adamson (qntmpkt(AT)yahoo.com), Nov 11 2008
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