101541domain: NAppears in sequencesNumber of ways to place 3 points on a triangular grid of side n so that no two of them are adjacent.at n=11A239569E.g.f. A(x) satisfies: [x^n] A(x)^(5*n) = (n+4) * [x^(n-1)] A(x)^(5*n) for n>=1.at n=5A300990