14349084877domain: NAppears in sequencesAntidiagonal sums of triangle A118180: a(n) = Sum_{k=0..[n/2]} (3^k)^(n-2*k) for n>=0.at n=13A118182a(n) = a(n-1)*3^n + 1 where a(0)=1.at n=6A371441