a(n) = 7*a(n-1) - 4*a(n-2), with a(0) = 0, a(1) = 1.
A190973
a(n) = 7*a(n-1) - 4*a(n-2), with a(0) = 0, a(1) = 1.
Terms
- a(0) =0a(1) =1a(2) =7a(3) =45a(4) =287a(5) =1829a(6) =11655a(7) =74269a(8) =473263a(9) =3015765a(10) =19217303a(11) =122458061a(12) =780337215a(13) =4972528261a(14) =31686348967a(15) =201914329725
External references
- oeis: A190973