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A062124
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Fourth column of A046741.
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1
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3, 26, 94, 234, 473, 838, 1356, 2054, 2959, 4098, 5498, 7186, 9189, 11534, 14248, 17358, 20891, 24874, 29334, 34298, 39793, 45846, 52484, 59734, 67623, 76178, 85426, 95394, 106109, 117598, 129888, 143006, 156979, 171834, 187598, 204298
(list; graph; refs; listen; history; internal format)
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OFFSET
| 0,1
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REFERENCES
| I. P. Goulden and D. M. Jackson, Combinatorial Enumeration, Wiley, N.Y., 1983,(2.3.14).
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FORMULA
| G.f.: (3+14*x+8*x^2+2*x^3)/(1-x)^4. 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).
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CROSSREFS
| Cf. dumbbells: A002940, A002941, A002889, A046741, A055608, A062123-A062127.
Sequence in context: A191590 A177511 A048372 * A169832 A100606 A055330
Adjacent sequences: A062121 A062122 A062123 * A062125 A062126 A062127
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KEYWORD
| easy,nonn
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AUTHOR
| Vladeta Jovovic (vladeta(AT)eunet.rs), Jun 04 2001
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EXTENSIONS
| More terms from Larry Reeves (larryr(AT)acm.org), Jun 06 2001
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