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Search: id:A055883
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| 1, 1, 1, 2, 4, 2, 5, 15, 15, 5, 15, 60, 90, 60, 15, 52, 260, 520, 520, 260, 52, 203, 1218, 3045, 4060, 3045, 1218, 203, 877, 6139, 18417, 30695, 30695, 18417, 6139, 877, 4140, 33120, 115920, 231840, 289800, 231840, 115920, 33120, 4140, 21147
(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(n,k), 0<=k<=n, read by rows, given by [1, 1, 1, 2, 1, 3, 1, 4, 1, 5, 1, 6, ...] DELTA [1, 1, 1, 2, 1, 3, 1, 4, 1, 5, 1, 6, ...] where DELTA is the operator defined in A084938 . - DELEHAM Philippe (kolotoko(aT)lagoon.nc), Aug 10 2005
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LINKS
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N. J. A. Sloane, Transforms
Index entries for triangles and arrays related to Pascal's triangle
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FORMULA
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a(n, k)=Bell(n)*C(n, k). E.g.f.: A(x, y)=exp(exp(x+xy)-1).
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EXAMPLE
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1; 1,1; 2,4,2; 5,15,15,5; 15,60,90,60,15; ...
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CROSSREFS
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Cf. A000110, A007318. Row sums give A055882.
Sequence in context: A117903 A120493 A085880 this_sequence A085843 A135690 A010241
Adjacent sequences: A055880 A055881 A055882 this_sequence A055884 A055885 A055886
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KEYWORD
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nonn,tabl
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AUTHOR
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Christian G. Bower (bowerc(AT)usa.net), Jun 09 2000
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