Squares that differ from a triangular number by 1.

Terms

a(0) =0a(1) =1a(2) =4a(3) =9a(4) =16a(5) =121a(6) =324a(7) =529a(8) =4096a(9) =11025a(10) =17956a(11) =139129a(12) =374544a(13) =609961a(14) =4726276a(15) =12723489a(16) =20720704a(17) =160554241a(18) =432224100a(19) =703893961a(20) =5454117904a(21) =14682895929a(22) =23911673956a(23) =185279454481a(24) =498786237504a(25) =812293020529