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Search: id:A059483
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| A059483 |
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Triangle T(n,k) = number of fixed 2 X n polyominoes with k cells = coefficient of x^n*y^k in (1+x*y)/(1-x*y-x*y^2-x^2*y^3)-1, read by rows in order 00, 10, 01, 20, 11, 02, ... |
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+0
1
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| 0, 0, 0, 0, 2, 0, 0, 0, 1, 0, 0, 0, 2, 0, 0, 0, 0, 0, 4, 0, 0, 0, 0, 0, 2, 1, 0, 0, 0, 0, 0, 0, 8, 0, 0, 0, 0, 0, 0, 0, 2, 6, 0, 0, 0, 0, 0, 0, 0, 0, 12, 1, 0, 0, 0, 0, 0, 0, 0, 0, 2, 18, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 16, 8, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
(list; table; graph; listen)
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OFFSET
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0,5
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REFERENCES
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R. C. Read, Contributions to the cell growth problem, Canad. J. Math., 14 (1962), 1-20.
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LINKS
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N. J. A. Sloane, Transforms
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MAPLE
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read transforms; (1+x*y)/(1-x*y-x*y^2-x^2*y^3)-1; SERIES2(%, x, y, 12): SERIES2TOLIST(%, x, y, 12);
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CROSSREFS
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Sequence in context: A160383 A101436 A056170 this_sequence A067618 A055029 A126812
Adjacent sequences: A059480 A059481 A059482 this_sequence A059484 A059485 A059486
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KEYWORD
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nonn,tabl,easy
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AUTHOR
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N. J. A. Sloane (njas(AT)research.att.com), Feb 04 2001
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