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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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1
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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; refs; listen; history; internal format)
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OFFSET
| 0,5
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COMMENTS
| 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
| 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
| Sequence in context: A114276 A152879 A098747 * A117425 A168216 A091698
Adjacent sequences: A122894 A122895 A122896 * A122898 A122899 A122900
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KEYWORD
| easy,nonn,tabl
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AUTHOR
| Paul Barry (pbarry(AT)wit.ie), Sep 18 2006
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