78466domain: NAppears in sequencesExpansion of Product_{k>=1} ((1 + 2^k*x^k)/(1 - 2^k*x^k))^(1/2^k).at n=16A303438Number of parity-alternating permutations of [n] avoiding the pattern 321.at n=19A354208Number of parity-alternating permutations of [n] avoiding the pattern 123.at n=19A355089