|
| |
|
|
A109119
|
|
2(5n^2+5n+1)^3.
|
|
0
| |
|
|
2, 2662, 59582, 453962, 2060602, 6885902, 18787862, 44376082, 94091762, 183467702, 334568302, 577609562, 952759082, 1512116062, 2321871302, 3464647202, 5042017762, 7177208582, 10017976862, 13739671402, 18548472602
(list; graph; refs; listen; history; internal format)
|
|
|
|
OFFSET
| 0,1
|
|
|
COMMENTS
| 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+1324z+20495z^2+46360z^3+20495z^4+1324z^5+z^6)/(1-z)^7.
|
|
|
MAPLE
| a:=n->2*(5*n^2+5*n+1)^3: seq(a(n), n=0..28);
|
|
|
CROSSREFS
| Sequence in context: A135234 A199948 A114067 * A002495 A078457 A128148
Adjacent sequences: A109116 A109117 A109118 * A109120 A109121 A109122
|
|
|
KEYWORD
| nonn
|
|
|
AUTHOR
| Emeric Deutsch (deutsch(AT)duke.poly.edu), Jun 19 2005
|
| |
|
|
