17179738110domain: NAppears in sequencesRow sums of triangle T(m,n) = number of solutions to 1 <= a(1) < a(2) < ... < a(m) <= n, where gcd(a(1), a(2), ..., a(m), n) = 1, in A020921.at n=33A038199Number of triangles similar to their n-th pedal, and not similar to any k-th pedal for k < n.at n=16A102536a(n) = 4^n-2^n-2.at n=16A170940