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Search: id:A059716
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| A059716 |
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Number of column convex polyominoes with n hexagonal cells. |
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+0
1
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| 1, 3, 11, 42, 162, 626, 2419, 9346, 36106, 139483, 538841, 2081612, 8041537, 31065506, 120010109, 463614741, 1791004361, 6918884013, 26728553546, 103255896932, 398891029862, 1540968200661, 5952961630324, 22997069087436
(list; graph; listen)
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OFFSET
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1,2
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REFERENCES
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D. A. Klarner, Cell growth problems, Canad. J. Math. 19 (1967) 851-863
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LINKS
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Moa Apagodu, Counting hexagonal lattice animals.
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FORMULA
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G.f.: x(1-x)^3/(1-6x+10x^2-7x^3+x^4).
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MAPLE
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gf := x*(1-x)^3/(1-6*x+10*x^2-7*x^3+x^4): s := series(gf, x, 50): for i from 1 to 100 do printf(`%d, `, coeff(s, x, i)) od:
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CROSSREFS
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Sequence in context: A099489 A077830 A106460 this_sequence A122368 A032443 A117641
Adjacent sequences: A059713 A059714 A059715 this_sequence A059717 A059718 A059719
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KEYWORD
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nonn
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AUTHOR
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Mireille Bousquet-Melou (bousquet(AT)labri.u-bordeaux.fr), Feb 08 2001
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EXTENSIONS
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More terms from James A. Sellers (sellersj(AT)math.psu.edu), Feb 09 2001
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