a(n) = (1 + 24^n*(23*n - 1))/529.

A014942

a(n) = (1 + 24^n*(23*n - 1))/529.

Terms

    a(0) =1a(1) =49a(2) =1777a(3) =57073a(4) =1715953a(5) =49491697a(6) =1387212529a(7) =38078983921

External references