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Search: id:A125692
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| A125692 |
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Riordan array (1-x*c(-x^2),x(1-x*c(-x^2)) where c(x) is the g.f. of A000108. |
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+0
1
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| 1, -1, 1, 0, -2, 1, 1, 1, -3, 1, 0, 2, 3, -4, 1, -2, -2, 2, 6, -5, 1, 0, -4, -6, 0, 10, -6, 1, 5, 5, -3, -11, -5, 15, -7, 1, 0, 10, 15, 4, -15, -14, 21, -8, 1, -14, -14, 6, 26, 19, -15, -28, 28, -9, 1, 0, -28, -42, -16, 30, 42, -7, -48, 36, -10, 1
(list; table; graph; listen)
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OFFSET
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0,5
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COMMENT
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Row sums are aerated signed Catalan numbers with g.f. c(-x^2). Inverse of A105306. First column is A105523.
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EXAMPLE
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Triangle begins
1,
-1, 1,
0, -2, 1,
1, 1, -3, 1,
0, 2, 3, -4, 1,
-2, -2, 2, 6, -5, 1,
0, -4, -6, 0, 10, -6, 1
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CROSSREFS
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Sequence in context: A110858 A125090 A073266 this_sequence A128258 A104967 A098495
Adjacent sequences: A125689 A125690 A125691 this_sequence A125693 A125694 A125695
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KEYWORD
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easy,sign,tabl
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AUTHOR
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Paul Barry (pbarry(AT)wit.ie), Nov 30 2006
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