a(n) = floor(11^n/2^n).

Terms

a(0) =1a(1) =5a(2) =30a(3) =166a(4) =915a(5) =5032a(6) =27680a(7) =152243a(8) =837339a(9) =4605366a(10) =25329516a(11) =139312339a(12) =766217865a(13) =4214198259a(14) =23178090428a(15) =127479497357a(16) =701137235467