

A088972


Triangle read by rows: colored polyominoes. For n >= 1, 1 <= k <= n, T(n, k) is the number of kcolored ncelled polyominoes, counted up to rotation, reflection and permutation of the colors. Adjacent cells must be different colors. T(n, k) counts only polyominoes that include all k colors.


0



1, 0, 1, 0, 2, 2, 0, 5, 10, 5, 0, 12, 66, 55, 12, 0, 35, 415, 695, 285, 35, 0, 108, 2844, 8227, 6080, 1446, 108, 0, 369, 19875, 95697, 113418, 46441, 7140, 369, 0, 1285, 142046, 1092358, 1964647, 1238196, 320074, 34385, 1285, 0, 4655, 1026197, 12351464
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OFFSET

1,5


COMMENTS

For n > 1, T(n, 2) = T(n, n) = A000105(n).


LINKS

Table of n, a(n) for n=1..49.
D. Wasserman, Illustrations of colored pentominoes and hexominoes


EXAMPLE

RBRG is considered the same as BRBG, but different from RBGR.
1; 0,1; 0,2,2; 0,5,10,5; ...


PROG

See the link for MATLAB code.


CROSSREFS

Cf. A000105.
Sequence in context: A329687 A321127 A222128 * A168505 A100334 A277295
Adjacent sequences: A088969 A088970 A088971 * A088973 A088974 A088975


KEYWORD

nonn,tabl,less


AUTHOR

David Wasserman, Oct 30 2003


STATUS

approved



