a(n) = (A262024(n)-1)/2: a(n)*(a(n) + 1) = d(n)*Y(n)^2 with d(n) = A007969 and Y(n) = A261250(n).

Terms

a(0) =1a(1) =4a(2) =2a(3) =9a(4) =3a(5) =324a(6) =7a(7) =16a(8) =8a(9) =4a(10) =27a(11) =98a(12) =25a(13) =63a(14) =4900a(15) =5a(16) =11a(17) =17a(18) =36a(19) =18a(20) =12a(21) =1024a(22) =6a(23) =99a(24) =80a(25) =12167a(26) =49a(27) =324a(28) =33124a(29) =242