a(n) = Sum_{1 <= m <= n} Sum_{1 <= k <= n+1-m} m*R(k,n+1), where R(k,b) = (b^k - 1)/(b - 1) is the base-b repunit of length k.
A332082
a(n) = Sum_{1 <= m <= n} Sum_{1 <= k <= n+1-m} m*R(k,n+1), where R(k,b) = (b^k - 1)/(b - 1) is the base-b repunit of length k.
Terms
- a(0) =0a(1) =1a(2) =7a(3) =42a(4) =295a(5) =2675a(6) =31122a(7) =447188a(8) =7661370a(9) =152415765a(10) =3452271185a(11) =87693358654
External references
- oeis: A332082