a(n) = n^2 + (n concatenated with n).

Terms

a(0) =12a(1) =26a(2) =42a(3) =60a(4) =80a(5) =102a(6) =126a(7) =152a(8) =180a(9) =1110a(10) =1232a(11) =1356a(12) =1482a(13) =1610a(14) =1740a(15) =1872a(16) =2006a(17) =2142a(18) =2280a(19) =2420a(20) =2562a(21) =2706a(22) =2852a(23) =3000a(24) =3150a(25) =3302a(26) =3456a(27) =3612a(28) =3770a(29) =3930