a(n) = Sum_{k>=0} k^(2*n+1)/2^(k+1).A308865a(n) = Sum_{k>=0} k^(2*n+1)/2^(k+1).Terms a(0) =1a(1) =13a(2) =541a(3) =47293a(4) =7087261a(5) =1622632573a(6) =526858348381External referencesoeis: A308865