Vauban's sequence: a(n)=0 if n<=0, a(1)=1; thereafter a(n) = 3*a(n-1) + 6*a(n-2) + 6*a(n-3) + 6*a(n-4) + 6*a(n-5).
A224749
Vauban's sequence: a(n)=0 if n<=0, a(1)=1; thereafter a(n) = 3*a(n-1) + 6*a(n-2) + 6*a(n-3) + 6*a(n-4) + 6*a(n-5).
Terms
- a(0) =0a(1) =1a(2) =3a(3) =15a(4) =69a(5) =321a(6) =1491a(7) =6921a(8) =32139a(9) =149229a(10) =692919a(11) =3217437a(12) =14939559a(13) =69369021a(14) =322101927a(15) =1495619397a(16) =6944625855a(17) =32246056989a(18) =149728468167a(19) =695235829509
External references
- oeis: A224749