OFFSET
1,2
COMMENTS
The division of a polypon into triangles is considered significant for this sequence, as for A057784. - Joseph Myers, Oct 02 2011
LINKS
Ed Pegg, Jr., Illustrations of polyforms
Eric Weisstein's World of Mathematics, Polypon
CROSSREFS
KEYWORD
nonn,hard,more
AUTHOR
Ed Pegg Jr, May 13 2009
EXTENSIONS
a(19)-a(26) from Joseph Myers, Oct 02 2011
STATUS
approved