-1555

Appears in sequences

• A transform of the Fibonacci numbers.at n=43A099505
• First differences of number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 441", based on the 5-celled von Neumann neighborhood.at n=27A272224
• Expansion of e.g.f. 1/(1 + (exp(x) - 1)/(1 + (exp(x) - 1)^2/(1 + (exp(x) - 1)^3/(1 + ...)))), a continued fraction.at n=7A301923
• a(n) = Sum_{k=0..floor(n/3)} (-1)^k * binomial(n-2*k,k) * Catalan(k).at n=20A360025