Centered 27-gonal numbers.

Terms

a(0) =1a(1) =28a(2) =82a(3) =163a(4) =271a(5) =406a(6) =568a(7) =757a(8) =973a(9) =1216a(10) =1486a(11) =1783a(12) =2107a(13) =2458a(14) =2836a(15) =3241a(16) =3673a(17) =4132a(18) =4618a(19) =5131a(20) =5671a(21) =6238a(22) =6832a(23) =7453a(24) =8101a(25) =8776a(26) =9478a(27) =10207a(28) =10963a(29) =11746