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

Terms

a(0) =0a(1) =1a(2) =13a(3) =36a(4) =70a(5) =115a(6) =171a(7) =238a(8) =316a(9) =405a(10) =505a(11) =616a(12) =738a(13) =871a(14) =1015a(15) =1170a(16) =1336a(17) =1513a(18) =1701a(19) =1900a(20) =2110a(21) =2331a(22) =2563a(23) =2806a(24) =3060a(25) =3325a(26) =3601a(27) =3888a(28) =4186a(29) =4495