52370domain: NAppears in sequencesa(n+1) = Sum_{k=0..floor(4*n/5)} a(k) * a(n-k).at n=15A030039a(0) = 2 and, for n >= 1, rewrite 0->100 in the binary expansion of n and append 10 to the right.at n=40A080310Number of subsets of {1..n} whose cardinality is equal to the sum of some subset.at n=16A367216