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Search: id:A052253
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| A052253 |
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Triangle T(n,k) (n >= 1, k >= 1) giving filtration of bigrading of Hopf algebra of rooted trees. |
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1
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| 1, 1, 1, 2, 1, 1, 3, 3, 2, 1, 8, 5, 4, 2, 1, 16, 13, 9, 6, 3, 1, 41, 28, 21, 13, 8, 3, 1, 98, 71, 49, 33, 20, 10, 4, 1, 250, 174, 121, 79, 50, 27, 13, 4, 1, 631, 445, 304, 201, 127, 74, 38, 16, 5, 1, 1646, 1137, 776, 510, 325, 192, 106, 49, 19, 5, 1, 4285, 2974
(list; table; graph; listen)
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OFFSET
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0,4
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LINKS
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D. J. Broadhurst and D. Kreimer, Towards cohomology of renormalization...
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EXAMPLE
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1; 1,1; 2,1,1; 3,3,2,1; 8,5,4,2,1; ...
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CROSSREFS
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Cf. A052250.
Sequence in context: A034929 A099509 A131336 this_sequence A127838 A017817 A053268
Adjacent sequences: A052250 A052251 A052252 this_sequence A052254 A052255 A052256
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KEYWORD
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nonn,nice,tabl
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AUTHOR
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David Broadhurst (D.Broadhurst(AT)open.ac.uk), Feb 05 2000
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