a(n) = 3^n*A(2*n), where A(n) = 3*A(n-1) + A(n-2) - A(n-3)/3 with A(0)=A(1)=3, A(2)=11.
A215948
a(n) = 3^n*A(2*n), where A(n) = 3*A(n-1) + A(n-2) - A(n-3)/3 with A(0)=A(1)=3, A(2)=11.
Terms
- a(0) =3a(1) =33a(2) =1035a(3) =33273a(4) =1070163a(5) =34420113a(6) =1107069147a(7) =35607149289
External references
- oeis: A215948