111265domain: NAppears in sequences4-dimensional pyramidal numbers: a(n) = n^2*(n^2-1)/12.at n=34A002415a(n) = n^2 * (4*n^2 - 1) / 3.at n=17A187756Positions of squares in A048153.at n=16A199551a(n) = n!! mod n!!!at n=17A217649Expansion of Product_{1 <= i_1 <= i_2 <= i_3 <= i_4} (1 + x^(i_1*i_2*i_3*i_4)).at n=50A321567