The intersection of hexagonal numbers (A000384) and centered 9-gonal numbers (A060544).

Terms

a(0) =1a(1) =28a(2) =91a(3) =190a(4) =325a(5) =496a(6) =703a(7) =946a(8) =1225a(9) =1540a(10) =1891a(11) =2278a(12) =2701a(13) =3160a(14) =3655a(15) =4186a(16) =4753a(17) =5356a(18) =5995a(19) =6670a(20) =7381a(21) =8128a(22) =8911a(23) =9730a(24) =10585a(25) =11476a(26) =12403a(27) =13366a(28) =14365a(29) =15400