a(n) = 23*n^2.

Terms

a(0) =0a(1) =23a(2) =92a(3) =207a(4) =368a(5) =575a(6) =828a(7) =1127a(8) =1472a(9) =1863a(10) =2300a(11) =2783a(12) =3312a(13) =3887a(14) =4508a(15) =5175a(16) =5888a(17) =6647a(18) =7452a(19) =8303a(20) =9200a(21) =10143a(22) =11132a(23) =12167a(24) =13248a(25) =14375a(26) =15548a(27) =16767a(28) =18032a(29) =19343