a(n) = Sum_{k=0..n} (k+1) * 8^k * binomial(2*n+2,n-k).
A386986
a(n) = Sum_{k=0..n} (k+1) * 8^k * binomial(2*n+2,n-k).
Terms
- a(0) =1a(1) =20a(2) =303a(3) =4088a(4) =51730a(5) =628488a(6) =7423899a(7) =85904688a(8) =978506478a(9) =11008191800a(10) =122603713078
External references
- oeis: A386986