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Search: id:A147720
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| A147720 |
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Riordan array (1, x(1-x)/(1-3x)). |
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+0
5
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| 1, 0, 1, 0, 2, 1, 0, 6, 4, 1, 0, 18, 16, 6, 1, 0, 54, 60, 30, 8, 1, 0, 162, 216, 134, 48, 10, 1, 0, 486, 756, 558, 248, 70, 12, 1, 0, 1458, 2592, 2214, 1168, 410, 96, 14, 1, 0, 4374, 8748, 8478, 5160, 2150, 628, 126, 16
(list; table; graph; listen)
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OFFSET
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0,5
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COMMENT
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Array [0,2,1,0,0,0,....] DELTA [1,0,0,0,......] for Deleham DELTA as in A084938.
Row sums are A001835. Diagonal sums are related to A030186.
Row sums of inverse are essentially A091593. A147720*A007318 is A147721.
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FORMULA
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Sum_{k, 0<=k<=n}T(n,k)*x^k = A000007(n), A001835(n), A147722(n), A084120(n) for x = 0, 1, 2, 3 respectively. [From Philippe DELEHAM (kolotoko(AT)wanadoo.fr), Nov 15 2008]
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EXAMPLE
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Triangle begins
1,
0, 1,
0, 2, 1,
0, 6, 4, 1,
0, 18, 16, 6, 1,
0, 54, 60, 30, 8, 1,
0, 162, 216, 134, 48, 10, 1
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CROSSREFS
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Sequence in context: A122930 A066387 A011312 this_sequence A127631 A122538 A090238
Adjacent sequences: A147717 A147718 A147719 this_sequence A147721 A147722 A147723
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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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