Squares of odd octagonal numbers.

Terms

a(0) =1a(1) =441a(2) =4225a(3) =17689a(4) =50625a(5) =116281a(6) =231361a(7) =416025a(8) =693889a(9) =1092025a(10) =1640961a(11) =2374681a(12) =3330625a(13) =4549689a(14) =6076225a(15) =7958041a(16) =10246401a(17) =12996025a(18) =16265089a(19) =20115225a(20) =24611521a(21) =29822521a(22) =35820225a(23) =42680089a(24) =50481025a(25) =59305401