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 A059483 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, ... 0
 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; refs; listen; history; text; internal format)
 OFFSET 0,5 LINKS R. C. Read, Contributions to the cell growth problem, Canad. J. Math., 14 (1962), 1-20. N. J. A. Sloane, Transforms MAPLE read transforms; (1+x*y)/(1-x*y-x*y^2-x^2*y^3)-1; SERIES2(%, x, y, 12): SERIES2TOLIST(%, x, y, 12); CROSSREFS Sequence in context: A101436 A056170 A248395 * A067618 A279255 A055029 Adjacent sequences:  A059480 A059481 A059482 * A059484 A059485 A059486 KEYWORD nonn,tabl,easy AUTHOR N. J. A. Sloane, Feb 04 2001 STATUS approved

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Last modified August 2 02:53 EDT 2021. Contains 346409 sequences. (Running on oeis4.)