213529

Appears in sequences

• Triangle read by rows: T(n,m) = (-1)^n*Sum_{i=0..m} (-1)^(m-i)*binomial(n-i-1, m-i)*Stirling_1(n+i+1,i+1), for 0 <= m <= n.at n=19A156528
• Number of active (ON, black) cells at stage 2^n-1 of the two-dimensional cellular automaton defined by "Rule 422", based on the 5-celled von Neumann neighborhood.at n=9A272086