524414domain: NAppears in sequencesSums of two (not necessarily distinct) Mersenne primes (A000668).at n=24A171251Number of (n+1) X (6+1) 0..1 arrays with nondecreasing x(i,j)-x(i,j-1) in the i direction and nonincreasing x(i,j)-x(i-1,j) in the j direction.at n=17A250740