295625domain: NAppears in sequencesE.g.f. satisfies log(A(x)) = (exp(x * A(x)) - 1)^3 / 6.at n=9A357032a(n) is the number of regions into which three-dimensional Euclidean space is divided by n-1 planes parallel to each face of a regular tetrahedron with edge length n, dividing the edges into unit segments.at n=42A364401