|
Search: id:A109116
|
|
| |
|
| 20, 432, 3024, 12800, 40500, 105840, 241472, 497664, 947700, 1694000, 2874960, 4672512, 7320404, 11113200, 16416000, 23674880, 33428052, 46317744, 63102800, 84672000, 112058100, 146452592, 189221184, 241920000, 306312500, 384387120
(list; graph; listen)
|
|
|
OFFSET
|
0,1
|
|
|
COMMENT
|
Kekule numbers for certain benzenoids.
|
|
REFERENCES
|
S. J. Cyvin and I. Gutman, Kekule structures in benzenoid hydrocarbons, Lecture Notes in Chemistry, No. 46, Springer, New York, 1988 (pp. 310).
|
|
FORMULA
|
G.f.=4(5+73z+105z^2+z^3-4z^4)/(1-z)^7
|
|
MAPLE
|
a:=n->(n+1)^3*(n+2)^2*(n+5): seq(a(n), n=0..30);
|
|
CROSSREFS
|
Sequence in context: A068772 A158601 A130832 this_sequence A136257 A099278 A111158
Adjacent sequences: A109113 A109114 A109115 this_sequence A109117 A109118 A109119
|
|
KEYWORD
|
nonn
|
|
AUTHOR
|
Emeric Deutsch (deutsch(AT)duke.poly.edu), Jun 19 2005
|
|
|
Search completed in 0.002 seconds
|