Squares composed of two '1-digit' overlapping subsquares.

Terms

a(0) =3249a(1) =81225a(2) =225625a(3) =364816a(4) =2079364a(5) =4950625a(6) =39601849a(7) =44156025a(8) =84180625a(9) =92294449a(10) =116964225a(11) =267289801a(12) =341991049a(13) =643890625a(14) =1212780625a(15) =1445900625a(16) =1699500625a(17) =2307361225a(18) =2924105625a(19) =2998438564a(20) =3204126025