a(1)=1, a(n) = 21*a(n-1) + n.
A014905
a(1)=1, a(n) = 21*a(n-1) + n.
Terms
- a(0) =1a(1) =23a(2) =486a(3) =10210a(4) =214415a(5) =4502721a(6) =94557148a(7) =1985700116a(8) =41699702445a(9) =875693751355
External references
- oeis: A014905
A014905
a(1)=1, a(n) = 21*a(n-1) + n.