(1/18)*Difference between concatenation of n and n^2 and concatenation of n^2 and n.

Terms

a(0) =0a(1) =-1a(2) =-3a(3) =14a(4) =15a(5) =15a(6) =14a(7) =12a(8) =9a(9) =5a(10) =-55a(11) =-126a(12) =-208a(13) =-301a(14) =-405a(15) =-520a(16) =-646a(17) =-783a(18) =-931a(19) =-1090a(20) =-1260a(21) =-1441a(22) =-1633a(23) =-1836a(24) =-2050a(25) =-2275a(26) =-2511a(27) =-2758a(28) =-3016a(29) =-3285