a(n) = (10*n)^2.

Terms

a(0) =0a(1) =100a(2) =400a(3) =900a(4) =1600a(5) =2500a(6) =3600a(7) =4900a(8) =6400a(9) =8100a(10) =10000a(11) =12100a(12) =14400a(13) =16900a(14) =19600a(15) =22500a(16) =25600a(17) =28900a(18) =32400a(19) =36100a(20) =40000a(21) =44100a(22) =48400a(23) =52900a(24) =57600a(25) =62500a(26) =67600a(27) =72900a(28) =78400a(29) =84100