28954domain: NAppears in sequencesa(n) = Sum_{k=0..n} T(n,k), T given by A026725.at n=14A026732a(n) = floor(A058303*(2^(n-2)+1/2)).at n=12A094393Cumulative sum of primes p such that 2^p - 1 is a Mersenne prime.at n=20A109472