a(n) = 7*a(n-1) + 42*a(n-2), n>2; a(0)=1, a(1)=1, a(2)=13.
A154999
a(n) = 7*a(n-1) + 42*a(n-2), n>2; a(0)=1, a(1)=1, a(2)=13.
Terms
- a(0) =1a(1) =1a(2) =13a(3) =133a(4) =1477a(5) =15925a(6) =173509a(7) =1883413a(8) =20471269a(9) =222402229a(10) =2416608901a(11) =26257155925a(12) =285297665317
External references
- oeis: A154999