a(1)=1, a(2)=17; thereafter a(n) = 6*a(n-1)-a(n-2)+c, where c=-4 if n is odd, c=12 if n is even.
A184327
a(1)=1, a(2)=17; thereafter a(n) = 6*a(n-1)-a(n-2)+c, where c=-4 if n is odd, c=12 if n is even.
Terms
- a(0) =1a(1) =17a(2) =97a(3) =577a(4) =3361a(5) =19601a(6) =114241a(7) =665857a(8) =3880897a(9) =22619537a(10) =131836321a(11) =768398401a(12) =4478554081a(13) =26102926097a(14) =152139002497a(15) =886731088897
External references
- oeis: A184327