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Search: id:A127631
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| A127631 |
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Square of Riordan array (1,xc(x)) where c(x) is the g.f. of A000108. |
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+0
2
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| 1, 0, 1, 0, 2, 1, 0, 6, 4, 1, 0, 21, 16, 6, 1, 0, 80, 66, 30, 8, 1, 0, 322, 280, 143, 48, 10, 1, 0, 1348, 1216, 672, 260, 70, 12, 1, 0, 5814, 5385, 3150, 1344, 425, 96, 14, 1, 0, 25674, 24244
(list; table; graph; listen)
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OFFSET
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0,5
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COMMENT
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Square of A106566. Row sums are A127632.
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FORMULA
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Riordan array (1,x*c(x)*c(x*c(x)))
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EXAMPLE
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Triangle begins
1,
0, 1,
0, 2, 1,
0, 6, 4, 1,
0, 21, 16, 6, 1,
0, 80, 66, 30, 8, 1,
0, 322, 280, 143, 48, 10, 1,
0, 1348, 1216, 672, 260, 70, 12, 1,
0, 5814, 5385, 3150, 1344, 425, 96, 14, 1,
0, 25674, 24244, 14799, 6784, 2400, 646, 126, 16, 1,
0, 115566, 110704, 69828, 33814, 13002, 3960, 931, 160, 18, 1
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CROSSREFS
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Sequence in context: A066387 A011312 A147720 this_sequence A122538 A090238 A047922
Adjacent sequences: A127628 A127629 A127630 this_sequence A127632 A127633 A127634
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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), Jan 20 2007
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