|
Search: id:A108648
|
|
|
| A108648 |
|
(n+1)^2*(n+2)^3*(n+3)/24. |
|
+0
1
|
|
| 1, 18, 120, 500, 1575, 4116, 9408, 19440, 37125, 66550, 113256, 184548, 289835, 441000, 652800, 943296, 1334313, 1851930, 2527000, 3395700, 4500111, 5888828, 7617600, 9750000, 12358125, 15523326, 19336968, 23901220, 29329875, 35749200
(list; graph; listen)
|
|
|
OFFSET
|
0,2
|
|
|
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 (p.230, no. 24).
|
|
MAPLE
|
a:=(n+1)^2*(n+2)^3*(n+3)/24: seq(a(n), n=0..36);
|
|
CROSSREFS
|
Sequence in context: A022678 A044350 A044731 this_sequence A037064 A077960 A107971
Adjacent sequences: A108645 A108646 A108647 this_sequence A108649 A108650 A108651
|
|
KEYWORD
|
nonn
|
|
AUTHOR
|
Emeric Deutsch (deutsch(AT)duke.poly.edu), Jun 13 2005
|
|
|
Search completed in 0.002 seconds
|
