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Search: id:A007817
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| A007817 |
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Number of abstract simplicial 2-complexes on {1,2,3,...,n+4} which triangulate a Moebius band in such a way that all vertices lie on the boundary and are traversed in the order 1,2,3,... as one goes around the boundary. |
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1
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| 1, 14, 113, 720, 4033, 20864, 102356, 483680, 2223482, 10009570, 44330931, 193798624, 838329841, 3595080184, 15305823256, 64766503744, 272635026526, 1142528179324, 4769415499234, 19842220567264
(list; graph; listen)
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OFFSET
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5,2
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REFERENCES
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R. P. Stanley, Enumerative Combinatorics, Cambridge, Vol. 2, 1999; see Problem 6.44.
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FORMULA
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There is an explicit g.f.
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CROSSREFS
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Sequence in context: A039630 A004408 A002409 this_sequence A044346 A044727 A071573
Adjacent sequences: A007814 A007815 A007816 this_sequence A007818 A007819 A007820
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KEYWORD
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nonn,easy,nice
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AUTHOR
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reiner(AT)math.umn.edu (Victor Reiner), edelman(AT)math.umn.edu (Paul Edelman)
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