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A054560
Number of labeled pure 2-complexes on n nodes (0-simplexes) with 5 2-simplexes and 11 1-simplexes.
0
6300, 89586, 549528
OFFSET
6,1
COMMENTS
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=11.
REFERENCES
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.
FORMULA
a(n)=6300*C(n, 6)+45486*C(n, 7)+9240*C(n, 8)+...
CROSSREFS
Cf. A054557.
Sequence in context: A213869 A350416 A189344 * A069428 A251024 A213993
KEYWORD
more,nonn,bref
AUTHOR
Vladeta Jovovic, Apr 10 2000
STATUS
approved