Smallest integer > 1 which is both n-gonal and centered n-gonal.

Terms

a(0) =10a(1) =25a(2) =51a(3) =91a(4) =148a(5) =225a(6) =325a(7) =451a(8) =606a(9) =793a(10) =1015a(11) =1275a(12) =1576a(13) =1921a(14) =2313a(15) =2755a(16) =3250a(17) =3801a(18) =4411a(19) =5083a(20) =5820a(21) =6625a(22) =7501a(23) =8451a(24) =9478a(25) =10585a(26) =11775a(27) =13051a(28) =14416a(29) =15873