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Search: id:A122897
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| A122897 |
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Riordan array (1/(1-x), c(x)-1) where c(x) is the g.f. of A000108. |
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+0
2
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| 1, 1, 1, 1, 3, 1, 1, 8, 5, 1, 1, 22, 19, 7, 1, 1, 64, 67, 34, 9, 1, 1, 196, 232, 144, 53, 11, 1, 1, 625, 804, 573, 261, 76, 13, 1, 1, 2055, 2806, 2211, 1171, 426, 103, 15, 1, 1, 6917, 9878, 8399
(list; table; graph; listen)
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OFFSET
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0,5
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COMMENT
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Product of A007318 and A122896. Inverse of Riordan array ((1+x+x^2)/(1+x)^2,x/(1+x)^2). Row sums are A024718.
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EXAMPLE
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Triangle begins
1,
1, 1,
1, 3, 1,
1, 8, 5, 1,
1, 22, 19, 7, 1,
1, 64, 67, 34, 9, 1,
1, 196, 232, 144, 53, 11, 1,
1, 625, 804, 573, 261, 76, 13, 1,
1, 2055, 2806, 2211, 1171, 426, 103, 15, 1,
1, 6917, 9878, 8399, 4979, 2126, 647, 134, 17, 1,
1, 23713, 35072, 31655, 20483, 9878, 3554, 932, 169, 19, 1
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CROSSREFS
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Sequence in context: A114276 A152879 A098747 this_sequence A117425 A091698 A134380
Adjacent sequences: A122894 A122895 A122896 this_sequence A122898 A122899 A122900
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KEYWORD
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easy,nonn,tabl
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AUTHOR
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Paul Barry (pbarry(AT)wit.ie), Sep 18 2006
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