login
The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons Foundation.

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A054562 Number of labeled pure 2-complexes on n nodes (0-simplexes) with 5 2-simplexes and 13 1-simplexes. 2
540, 65625, 1272320 (list; graph; refs; listen; history; text; internal format)
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=13.

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.

LINKS

Table of n, a(n) for n=6..8.

FORMULA

a(n)=540*C(n, 6)+61845*C(n, 7)+762440*C(n, 8)+...

CROSSREFS

Cf. A054557.

Sequence in context: A101705 A034620 A146196 * A056934 A238933 A003746

Adjacent sequences:  A054559 A054560 A054561 * A054563 A054564 A054565

KEYWORD

more,nonn,bref

AUTHOR

Vladeta Jovovic, Apr 10 2000

STATUS

approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified September 30 21:27 EDT 2020. Contains 337440 sequences. (Running on oeis4.)