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A155052
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Image of symmetric Catalan based triangle A155050 under ((1+x)/(1-x),x)^{-1}.
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1
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1, -1, 1, 1, -1, 1, -1, 1, -1, 1, 1, -1, 2, -1, 1, -1, 1, -2, 2, -1, 1, 1, -1, 2, 1, 2, -1, 1, -1, 1, -2, -1, 1, 2, -1, 1, 1, -1, 2, 1, 8, 1, 2, -1, 1, -1, 1, -2, -1, -8, 8, 1, 2, -1, 1, 1, -1, 2, 1, 8, 20, 8, 1, 2, -1, 1
(list; table; graph; refs; listen; history; internal format)
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OFFSET
| 0,13
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COMMENTS
| Row sums are aerated Catalan numbers (A000108).
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EXAMPLE
| Triangle begins
1,
-1, 1,
1, -1, 1,
-1, 1, -1, 1,
1, -1, 2, -1, 1,
-1, 1, -2, 2, -1, 1,
1, -1, 2, 1, 2, -1, 1,
-1, 1, -2, -1, 1, 2, -1, 1,
1, -1, 2, 1, 8, 1, 2, -1, 1,
-1, 1, -2, -1, -8, 8, 1, 2, -1, 1,
1, -1, 2, 1, 8, 20, 8, 1, 2, -1, 1
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CROSSREFS
| Sequence in context: A062831 A037828 A030419 * A096284 A163100 A139038
Adjacent sequences: A155049 A155050 A155051 * A155053 A155054 A155055
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KEYWORD
| sign,tabl
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AUTHOR
| Paul Barry (pbarry(AT)wit.ie), Jan 19 2009
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