OFFSET
1,2
LINKS
Ed Pegg, Jr., Illustrations of polyforms
Eric Weisstein's World of Mathematics, Polytan
CROSSREFS
KEYWORD
nonn,hard,more
AUTHOR
Ed Pegg Jr, May 13 2009
EXTENSIONS
a(13)-a(14) from George Sicherman, Sep 27 2012
a(15) from George Sicherman, Aug 06 2013
a(15) corrected and a(16)-a(20) from John Mason, Jan 07 2022
a(21)-a(22) from Aaron N. Siegel, Jun 07 2022
STATUS
approved