Centered 15-gonal numbers: a(n) = (15*n^2 - 15*n + 2)/2.

Terms

a(0) =1a(1) =16a(2) =46a(3) =91a(4) =151a(5) =226a(6) =316a(7) =421a(8) =541a(9) =676a(10) =826a(11) =991a(12) =1171a(13) =1366a(14) =1576a(15) =1801a(16) =2041a(17) =2296a(18) =2566a(19) =2851a(20) =3151a(21) =3466a(22) =3796a(23) =4141a(24) =4501a(25) =4876a(26) =5266a(27) =5671a(28) =6091a(29) =6526