55138domain: NAppears in sequencesa(n) = 729*n^2 - 442*n + 67.at n=8A157668Expansion of 1/(1 - x - x^2/(1 - x^2 - x^3/(1 - x^3 - x^4/(1 - x^4 - x^5/(1 - ...))))), a continued fraction.at n=18A306575Dirichlet convolution of the integer partition numbers A000041 with the number of divisors function A000005.at n=42A323766