OFFSET
1,4
COMMENTS
In some cases the act of removing a component square (temporarily) disconnects the polyomino before the component is reattached elsewhere. - Sean A. Irvine, Apr 13 2020
See A367435 for the case where the cells remaining after detaching the square to be moved must be a connected polyomino. - Pontus von Brömssen, Nov 18 2023
LINKS
Freddy Barrera, Picture for a(5), 2020.
Freddy Barrera, Picture for a(6), 2020.
Sean A. Irvine, Java program (github)
FUNG Cheok Yin, Tetrominoes
FUNG Cheok Yin, Maxima code for n = 4 and n = 5, Apr 13 2020
CROSSREFS
KEYWORD
nonn,more
AUTHOR
Bernardo Recamán, Nov 08 2004
EXTENSIONS
a(4) corrected by FUNG Cheok Yin, Feb 11 2020
a(5) corrected and a(6)-a(12) from Sean A. Irvine and Freddy Barrera, Apr 13 2020
a(13) from Pontus von Brömssen, Nov 05 2023
STATUS
approved