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Search: id:A147721
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| 1, 1, 1, 3, 4, 1, 11, 17, 7, 1, 41, 72, 40, 10, 1, 153, 301, 208, 72, 13, 1, 571, 1244, 1021, 446, 113, 16, 1, 2131, 5093, 4819, 2525, 813, 163, 19, 1, 7953, 20688, 22104, 13452, 5218, 1336, 222, 22, 1, 29681
(list; table; graph; listen)
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OFFSET
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0,4
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COMMENT
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Triangle T equal to [1,2,1,0,0,0,.....] DELTA [1,0,0,0,.....] for Deleham DELTA as in A084938.
T=A147720*A007318. Row sums are A147722.
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FORMULA
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Riordan array ((1-3x)/(1-4x+x^2), x(1-x)/(1-4x+x^2)).
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EXAMPLE
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Triangle begins
1,
1, 1,
3, 4, 1,
11, 17, 7, 1,
41, 72, 40, 10, 1,
153, 301, 208, 72, 13, 1
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CROSSREFS
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Sequence in context: A078068 A054649 A138263 this_sequence A114608 A154602 A109956
Adjacent sequences: A147718 A147719 A147720 this_sequence A147722 A147723 A147724
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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), Nov 11 2008
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