OFFSET
1,3
COMMENTS
Each free polyomino represented by a number in A246521 may correspond to 1, 2, 4 or 8 different fixed polyominoes, generated by rotation or reflection.
LINKS
Pontus von Brömssen, Table of n, a(n) for n = 1..6474 (polyominoes with up to 10 cells).
EXAMPLE
The size 4 L-shaped polyomino represented by A246521(6) will generate 8 fixed polyominoes.
CROSSREFS
KEYWORD
nonn
AUTHOR
John Mason, Jan 26 2021
STATUS
approved