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Search: id:A155052
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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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+0
2
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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; listen)
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OFFSET
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0,13
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COMMENT
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Row sums are aerated Catalan numbers (A000108).
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EXAMPLE
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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
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Sequence in context: A062831 A037828 A030419 this_sequence A096284 A163100 A139038
Adjacent sequences: A155049 A155050 A155051 this_sequence A155053 A155054 A155055
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KEYWORD
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sign,tabl
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AUTHOR
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Paul Barry (pbarry(AT)wit.ie), Jan 19 2009
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