414144

Appears in sequences

• a(n) contains n digits (either '1' or '4') and is divisible by 2^n.at n=5A053314
• Number T(n,k) of undirected labeled graphs on n nodes with exactly k cycle graphs as connected components; triangle T(n,k), n>=0, 0<=k<=n, read by rows.at n=57A215771
• Number of undirected labeled graphs on n nodes with exactly 2 cycle graphs as connected components.at n=8A215772