a(n) = 1250*n^2 - 100*n + 1.

Terms

a(0) =1151a(1) =4801a(2) =10951a(3) =19601a(4) =30751a(5) =44401a(6) =60551a(7) =79201a(8) =100351a(9) =124001a(10) =150151a(11) =178801a(12) =209951a(13) =243601a(14) =279751a(15) =318401a(16) =359551a(17) =403201a(18) =449351a(19) =498001a(20) =549151a(21) =602801a(22) =658951a(23) =717601a(24) =778751a(25) =842401a(26) =908551a(27) =977201a(28) =1048351a(29) =1122001