a(n) = A127546(n)^2.

Terms

a(0) =4a(1) =36a(2) =196a(3) =1444a(4) =9604a(5) =66564a(6) =454276a(7) =3118756a(8) =21362884a(9) =146458404a(10) =1003749124a(11) =6880038916a(12) =47155859716a(13) =323212716324