OFFSET
2,1
COMMENTS
a(10)>2000000, a(11)=24375, a(12)=133307113, a(13)=6715891, a(16)=189308, a(20)=9009. - Sean A. Irvine, Mar 24 2023
LINKS
Eric Weisstein's World of Mathematics, Polygonal Number
CROSSREFS
KEYWORD
nonn,more
AUTHOR
Ilya Gutkovskiy, Feb 20 2023
STATUS
approved