Polynomial (1/3)*n^3 + (9/2)*n^2 + (85/6)*n - 2.

Terms

a(0) =-2a(1) =17a(2) =47a(3) =90a(4) =148a(5) =223a(6) =317a(7) =432a(8) =570a(9) =733a(10) =923a(11) =1142a(12) =1392a(13) =1675a(14) =1993a(15) =2348a(16) =2742a(17) =3177a(18) =3655a(19) =4178a(20) =4748a(21) =5367a(22) =6037a(23) =6760a(24) =7538a(25) =8373a(26) =9267a(27) =10222a(28) =11240a(29) =12323