459360domain: NAppears in sequencesTriangle T(n,k) read by rows, where e.g.f. for T(n,k) is exp(x*y)*log(1+x)/(1-x).at n=48A073480Number of solutions to x^2 + y^2 + z^2 + t^2 == n (mod 2*n) for x,y,z,t in [0, 2*n).at n=29A229294Numbers k such that k and k+1 are both products of 2 triangular numbers.at n=29A356748