6710888domain: NAppears in sequencesNumber of subsets of {1,2,3,...,n} that sum to 0 mod 20.at n=27A068041Numbers k such that A003313(k) = A003313(10*k).at n=19A117151Unsigned row sums of triangle A118404.at n=25A118406a(n) = A137505(2n) + A137505(2n+1).at n=24A167291a(n) = A137505(2n) + A137505(2n+1).at n=25A167291