Concentric 22-gonal numbers.

Terms

a(0) =0a(1) =1a(2) =22a(3) =45a(4) =88a(5) =133a(6) =198a(7) =265a(8) =352a(9) =441a(10) =550a(11) =661a(12) =792a(13) =925a(14) =1078a(15) =1233a(16) =1408a(17) =1585a(18) =1782a(19) =1981a(20) =2200a(21) =2421a(22) =2662a(23) =2905a(24) =3168a(25) =3433a(26) =3718a(27) =4005a(28) =4312a(29) =4621