|
Search: id:A109118
|
|
| |
|
| 2, 250, 2662, 13718, 48778, 137842, 332750, 715822, 1409938, 2590058, 4496182, 7447750, 11859482, 18258658, 27303838, 39805022, 56745250, 79303642, 108879878, 147120118, 195944362, 257575250, 334568302, 429843598, 546718898
(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.=2(1+118z+477z^2+132z^3-13z^4+6z^5-z^6)/(1-z)^7.
|
|
MAPLE
|
a:=n->2*(n^2+3*n+1)^3: seq(a(n), n=0..30);
|
|
CROSSREFS
|
Sequence in context: A024349 A012529 A012527 this_sequence A034313 A070782 A078167
Adjacent sequences: A109115 A109116 A109117 this_sequence A109119 A109120 A109121
|
|
KEYWORD
|
nonn
|
|
AUTHOR
|
Emeric Deutsch (deutsch(AT)duke.poly.edu), Jun 19 2005
|
|
|
Search completed in 0.002 seconds
|
