a(n) = n*(9*n+2).

Terms

a(0) =0a(1) =11a(2) =40a(3) =87a(4) =152a(5) =235a(6) =336a(7) =455a(8) =592a(9) =747a(10) =920a(11) =1111a(12) =1320a(13) =1547a(14) =1792a(15) =2055a(16) =2336a(17) =2635a(18) =2952a(19) =3287a(20) =3640a(21) =4011a(22) =4400a(23) =4807a(24) =5232a(25) =5675a(26) =6136a(27) =6615a(28) =7112a(29) =7627