|
Search: id:A062123
|
|
| |
|
| 2, 11, 29, 56, 92, 137, 191, 254, 326, 407, 497, 596, 704, 821, 947, 1082, 1226, 1379, 1541, 1712, 1892, 2081, 2279, 2486, 2702, 2927, 3161, 3404, 3656, 3917, 4187, 4466, 4754, 5051, 5357, 5672, 5996, 6329, 6671, 7022, 7382, 7751, 8129, 8516, 8912, 9317
(list; graph; listen)
|
|
|
OFFSET
|
0,1
|
|
|
COMMENT
|
Third column of A046741.
|
|
REFERENCES
|
I. P. Goulden and D. M. Jackson, Combinatorial Enumeration, Wiley, N.Y., 1983,(2.3.14).
|
|
FORMULA
|
G.f.: (1+2*x)*(2+x)/(1-x)^3. Generally, g.f. for k-th column of A046741 is coefficient of y^k in expansion of (1-y)/((1-y-y^2)*(1-y)-(1+y)*x).
|
|
CROSSREFS
|
Cf. dumbbells: A002940, A002941, A002889, A046741, A055608, A062124-A062127.
Sequence in context: A136317 A061238 A046500 this_sequence A117560 A024178 A009312
Adjacent sequences: A062120 A062121 A062122 this_sequence A062124 A062125 A062126
|
|
KEYWORD
|
easy,nonn
|
|
AUTHOR
|
Vladeta Jovovic (vladeta(AT)Eunet.yu), Jun 04 2001
|
|
EXTENSIONS
|
More terms from Larry Reeves (larryr(AT)acm.org), Jun 06 2001
|
|
|
Search completed in 0.002 seconds
|
