a(2n+2) = 9*a(2n+1), a(2n+1) = 9*a(2n) - 8^n*A000108(n), a(0)=1.
A156566
a(2n+2) = 9*a(2n+1), a(2n+1) = 9*a(2n) - 8^n*A000108(n), a(0)=1.
Terms
- a(0) =1a(1) =8a(2) =72a(3) =640a(4) =5760a(5) =51712a(6) =465408a(7) =4186112a(8) =37675008a(9) =339017728a(10) =3051159552a(11) =27459059712a(12) =247131537408
External references
- oeis: A156566