Second 13-gonal numbers: a(n) = n*(11*n+9)/2.

Terms

a(0) =0a(1) =10a(2) =31a(3) =63a(4) =106a(5) =160a(6) =225a(7) =301a(8) =388a(9) =486a(10) =595a(11) =715a(12) =846a(13) =988a(14) =1141a(15) =1305a(16) =1480a(17) =1666a(18) =1863a(19) =2071a(20) =2290a(21) =2520a(22) =2761a(23) =3013a(24) =3276a(25) =3550a(26) =3835a(27) =4131a(28) =4438a(29) =4756