a(n) = Sum_{k=1..A124259(n)} n^k.

Terms

a(0) =4a(1) =126a(2) =12a(3) =4a(4) =780a(5) =94036996914a(6) =56a(7) =8a(8) =9a(9) =1111111110a(10) =132a(11) =12a(12) =30940a(13) =8108730a(14) =240a(15) =16a(16) =306a(17) =18a(18) =380a(19) =20a(20) =204204a(21) =11154a(22) =552a(23) =24a(24) =25a(25) =702a(26) =27a(27) =28a(28) =732540a(29) =27930