104739domain: NAppears in sequencesConvolution of A000917 with A000984 (central binomial coefficients).at n=6A038697Semiprimes in A103377.at n=22A103397Semiprimes in A103378.at n=24A103398Semiprimes in A103379.at n=22A103399Semiprimes in A103380.at n=23A103400a(n) = A027306(n) + A027306(n-1) for n > 0; a(0) = 1.at n=17A248574