

A291807


The number of symmetric polyomino tilings of n X n square.


5




OFFSET

1,2


COMMENTS

The sequence gives the number of distinct tilings by polyominoes of a square with side n, considering tilings that have at least one symmetry. As for "free" polyominoes, tilings that are reflections or rotations of each other are not considered distinct.


LINKS



CROSSREFS

Cf. A268416 (polyominoes that will fit in nsided square), A291806 (polyomino tilings of square), A291808 (tilings with distinct polyominoes), A291809 (tilings with differently sized polyominoes).


KEYWORD

nonn,more


AUTHOR



STATUS

approved



