Centered 13-gonal numbers.

Terms

a(0) =1a(1) =14a(2) =40a(3) =79a(4) =131a(5) =196a(6) =274a(7) =365a(8) =469a(9) =586a(10) =716a(11) =859a(12) =1015a(13) =1184a(14) =1366a(15) =1561a(16) =1769a(17) =1990a(18) =2224a(19) =2471a(20) =2731a(21) =3004a(22) =3290a(23) =3589a(24) =3901a(25) =4226a(26) =4564a(27) =4915a(28) =5279a(29) =5656