Erroneous version of A003462.

Terms

a(0) =1a(1) =4a(2) =13a(3) =121a(4) =364a(5) =1093a(6) =3280a(7) =9841a(8) =29524a(9) =88573a(10) =265720a(11) =797161a(12) =2391484a(13) =7174453