100663294domain: NAppears in sequencesa(n) = 3*2^n - 2.at n=25A033484Number of bisymmetric, quasitrivial, and order-preserving binary operations on the n-element set {1,...,n}.at n=26A296953a(n) = n! * [x^n] (2*x - 4*exp(x) + 3*exp(2*x) + 3) / 2.at n=26A369491a(n) = gcd(2*n, 4^n)^(2*n + 1) mod (2^(2*n + 1) - 1)^2.at n=12A371402