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Search: id:A155586
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| A155586 |
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A modified Catalan sequence array. |
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+0
2
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| 1, 1, 1, 1, 1, 1, 1, 2, 1, 1, 1, 5, 2, 1, 1, 1, 14, 5, 2, 1, 1, 1, 42, 14, 5, 2, 1, 1, 1, 132, 42, 14, 5, 2, 1, 1, 1, 429, 132, 42, 14, 5, 2, 1, 1, 1, 1430, 429, 132, 42, 14, 5, 2, 1, 1, 1, 4862, 1430, 429, 132, 42, 14, 5, 2, 1, 1, 1, 16796, 4862, 1430, 429, 132, 42, 14, 5, 2, 1, 1
(list; table; graph; listen)
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OFFSET
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0,8
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COMMENT
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Row sums are A155587. Stieltjes associate array to A091491.
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FORMULA
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Number triangle T(n,k)=[k<=n]*if(k=0,1,A000108(n-k))
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EXAMPLE
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Triangle begins
1,
1, 1,
1, 1, 1,
1, 2, 1, 1,
1, 5, 2, 1, 1,
1, 14, 5, 2, 1, 1,
1, 42, 14, 5, 2, 1, 1,
1, 132, 42, 14, 5, 2, 1, 1,
1, 429, 132, 42, 14, 5, 2, 1, 1,
1, 1430, 429, 132, 42, 14, 5, 2, 1, 1
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CROSSREFS
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Sequence in context: A082063 A099940 A157249 this_sequence A069739 A066060 A008550
Adjacent sequences: A155583 A155584 A155585 this_sequence A155587 A155588 A155589
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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 24 2009
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