352782domain: NAppears in sequencesa(n) = 484*n^2 - 2*n.at n=26A158329Half the number of compositions of n into exactly two different parts with equal multiplicities.at n=30A242911a(n) = coefficient of x^n*y^n/n in log( Product_{n>=1} 1/(1 - (x^(2*n) - y^(2*n))/(x - y)) ), for n >= 1.at n=10A322191