a(n) = (5*n+1)*(5*n+6).

Terms

a(0) =6a(1) =66a(2) =176a(3) =336a(4) =546a(5) =806a(6) =1116a(7) =1476a(8) =1886a(9) =2346a(10) =2856a(11) =3416a(12) =4026a(13) =4686a(14) =5396a(15) =6156a(16) =6966a(17) =7826a(18) =8736a(19) =9696a(20) =10706a(21) =11766a(22) =12876a(23) =14036a(24) =15246a(25) =16506a(26) =17816a(27) =19176a(28) =20586a(29) =22046