a(n) = 169*n^2 + 140*n + 29.

Terms

a(0) =29a(1) =338a(2) =985a(3) =1970a(4) =3293a(5) =4954a(6) =6953a(7) =9290a(8) =11965a(9) =14978a(10) =18329a(11) =22018a(12) =26045a(13) =30410a(14) =35113a(15) =40154a(16) =45533a(17) =51250a(18) =57305a(19) =63698a(20) =70429a(21) =77498a(22) =84905a(23) =92650a(24) =100733a(25) =109154a(26) =117913a(27) =127010a(28) =136445a(29) =146218