76003583088domain: NAppears in sequencesa(n) = Pell(n)*A122859(n) for n>=1, with a(0)=1, where A122859 lists the coefficients in phi(-q)^3/phi(-q^3) and phi() is a Ramanujan theta function.at n=26A209452Solutions y to the negative Pell equation y^2 = 72*x^2 - 288 with x,y >= 0.at n=13A281234