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A147746
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Riordan array (1, x(1-2x)/(1-3x+x^2)).
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4
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1, 0, 1, 0, 1, 1, 0, 2, 2, 1, 0, 5, 5, 3, 1, 0, 13, 14, 9, 4, 1, 0, 34, 40, 28, 14, 5, 1, 0, 89, 114, 87, 48, 20, 6, 1, 0, 233, 323, 267, 161, 75, 27, 7, 1, 0, 610, 910, 809, 528, 270, 110, 35, 8, 1
(list; table; graph; refs; listen; history; internal format)
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OFFSET
| 0,8
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COMMENTS
| Triangle [0,1,1,1,0,0,0,....] DELTA [1,0,0,0,...] with Deleham DELTA as in A084938.
Note that 1/(1-x/(1-x/(1-x)))=(1-2x)/(1-3x+x^2). Row sums are A124302.
A147746*A007318=A147747.
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FORMULA
| Sum_{0<=k<=n} T(n,k)*2^k=A147748(n). - From DELEHAM Philippe, Oct 30 2011
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EXAMPLE
| Triangle begins
1,
0, 1,
0, 1, 1,
0, 2, 2, 1,
0, 5, 5, 3, 1,
0, 13, 14, 9, 4, 1,
0, 34, 40, 28, 14, 5, 1,
0, 89, 114, 87, 48, 20, 6, 1
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CROSSREFS
| Sequence in context: A112161 A128497 A011434 * A059365 A099039 A106566
Adjacent sequences: A147743 A147744 A147745 * A147747 A147748 A147749
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KEYWORD
| easy,nonn,tabl
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AUTHOR
| Paul Barry (pbarry(AT)wit.ie), Nov 11 2008
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