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A054562
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Number of labeled pure 2-complexes on n nodes (0-simplexes) with 5 2-simplexes and 13 1-simplexes.
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2
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OFFSET
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6,1
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COMMENTS
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Number of {T_1,T_2,...,T_k} where T_i,i=1..k are 3-subsets of an n-set such that {D | D is 2-subset of T_i for some i=1..k} has l elements; k=5,l=13.
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REFERENCES
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V. Jovovic, On the number of two-dimensional simplicial complexes (in Russian), Metody i sistemy tekhnicheskoy diagnostiki, Vypusk 16, Mezhvuzovskiy zbornik nauchnykh trudov, Izdatelstvo Saratovskogo universiteta, 1991.
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LINKS
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FORMULA
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a(n)=540*C(n, 6)+61845*C(n, 7)+762440*C(n, 8)+...
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CROSSREFS
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KEYWORD
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more,nonn,bref
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AUTHOR
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STATUS
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approved
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