a(n) = (4^n mod 3^n) mod 2^n.

Terms

a(0) =1a(1) =3a(2) =2a(3) =13a(4) =20a(5) =3a(6) =51a(7) =87a(8) =121a(9) =711a(10) =1139a(11) =3537a(12) =8034a(13) =15752a(14) =27922a(15) =49629a(16) =33201a(17) =35975a(18) =143900a(19) =136341a(20) =545364a(21) =2181456a(22) =1060135a(23) =4240540a(24) =16962160a(25) =28647197a(26) =13597858a(27) =205877827a(28) =100616667a(29) =381266393