Main diagonal of A101858.

Terms

a(0) =2a(1) =13a(2) =25a(3) =52a(4) =89a(5) =117a(6) =170a(7) =208a(8) =277a(9) =356a(10) =410a(11) =505a(12) =610a(13) =680a(14) =801a(15) =881a(16) =1018a(17) =1165a(18) =1261a(19) =1424a(20) =1530a(21) =1709a(22) =1898a(23) =2020a(24) =2225a(25) =2440a(26) =2578a(27) =2809a(28) =2957a(29) =3204