3000960domain: NAppears in sequencesExpansion of sin(x)*cos(tan(x)).at n=6A009535Expansion of sinh(x)*exp(tanh(x)).at n=13A009625Number of right triangles whose vertices are lattice points in {1,2,...,n} X {1,2,...,n}.at n=32A077435a(n) = Sum_{k=1..n} k^3*sigma(k), where sigma is A000203.at n=23A364194