a(n) = A000041(25*n + 24).A278559a(n) = A000041(25*n + 24).Terms a(0) =1575a(1) =173525a(2) =7089500a(3) =169229875a(4) =2841940500a(5) =37027355200a(6) =397125074750External referencesoeis: A278559