Smallest square that contains the digits of n in its exact middle.

Terms

a(0) =0a(1) =1a(2) =121a(3) =12321a(4) =4a(5) =256a(6) =169a(7) =576a(8) =289a(9) =9a(10) =8100a(11) =2116a(12) =361201a(13) =3136a(14) =181476a(15) =1156a(16) =16a(17) =101761a(18) =5184a(19) =281961a(20) =2209a(21) =9216a(22) =1225a(23) =182329a(24) =3249a(25) =25a(26) =292681a(27) =192721a(28) =8281a(29) =1296