|
| |
|
|
A182322
|
|
Number of simplicial 4-clusters with n cells. (Formerly M2679)
|
|
2
|
|
|
|
1, 1, 1, 3, 7, 30, 131, 795, 5152, 36800, 272093, 2077909, 16176607, 127996683, 1025727646, 8310377720, 67967600763, 560527576100, 4656993996246, 38949328897318, 327718211568300, 2772480181758683, 23571996461405321, 201327668784954950, 1726755218246463325
(list;
graph;
refs;
listen;
history;
text;
internal format)
|
|
|
|
OFFSET
|
1,4
|
|
|
COMMENTS
|
Some of the terms in the Hering article are in error, including the 6th, 8th and 9th.
|
|
|
REFERENCES
|
F. Hering et al., The enumeration of stack polytopes and simplicial clusters, Discrete Math., 40 (1982), 203-217.
N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).
|
|
|
LINKS
|
Table of n, a(n) for n=1..25.
|
|
|
FORMULA
|
(A007175+A182299)/2
|
|
|
CROSSREFS
|
This is the average of A007175 and A182299, both of which have Mathematica programs.
Sequence in context: A201794 A188229 A098644 * A132105 A019021 A110505
Adjacent sequences: A182319 A182320 A182321 * A182323 A182324 A182325
|
|
|
KEYWORD
|
nonn,easy
|
|
|
AUTHOR
|
Robert A. Russell, Apr 24 2012
|
|
|
STATUS
|
approved
|
| |
|
|
