(n+1)^2 concatenated with n^2.

Terms

a(0) =10a(1) =41a(2) =94a(3) =169a(4) =2516a(5) =3625a(6) =4936a(7) =6449a(8) =8164a(9) =10081a(10) =121100a(11) =144121a(12) =169144a(13) =196169a(14) =225196a(15) =256225a(16) =289256a(17) =324289a(18) =361324a(19) =400361a(20) =441400a(21) =484441a(22) =529484a(23) =576529a(24) =625576a(25) =676625a(26) =729676a(27) =784729a(28) =841784a(29) =900841