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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

Table of n, a(n) for n=0..92.

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 18 17:55 EDT 2018. Contains 313834 sequences. (Running on oeis4.)