Concentric 24-gonal numbers.

Terms

a(0) =0a(1) =1a(2) =24a(3) =49a(4) =96a(5) =145a(6) =216a(7) =289a(8) =384a(9) =481a(10) =600a(11) =721a(12) =864a(13) =1009a(14) =1176a(15) =1345a(16) =1536a(17) =1729a(18) =1944a(19) =2161a(20) =2400a(21) =2641a(22) =2904a(23) =3169a(24) =3456a(25) =3745a(26) =4056a(27) =4369a(28) =4704a(29) =5041