Index sequence for limit-reversing A000002; see Comments.

Terms

a(0) =1a(1) =4a(2) =7a(3) =16a(4) =25a(5) =31a(6) =43a(7) =61a(8) =70a(9) =88a(10) =97a(11) =115a(12) =220a(13) =286a(14) =322a(15) =475a(16) =557a(17) =1072a(18) =1334a(19) =1598a(20) =1751a(21) =1964a(22) =1991a(23) =2385a(24) =2494a(25) =2909a(26) =2936a(27) =3326a(28) =3935a(29) =4518