a(n) = 3^(-1+floor(n/2))*A(n), where A(n) = 3*A(n-1) + A(n-2) - A(n-3)/3 with A(0)=A(1)=3, A(2)=11.
A217336
a(n) = 3^(-1+floor(n/2))*A(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) =1a(1) =1a(2) =11a(3) =35a(4) =345a(5) =1129a(6) =11091a(7) =36315a(8) =356721a(9) =1168017a(10) =11473371a(11) =37567443a(12) =369023049a(13) =1208298105a(14) =11869049763a(15) =38863020555a(16) =381749439969
External references
- oeis: A217336