-3361

Appears in sequences

• a(n) = -a(n-2) + 2*a(n-4) - a(n-10).at n=25A089135
• G.f.: Sum_{n>=0} x^n / (1+x)^(2*n+1) * [Sum_{k=0..n} C(n,k)^2 * x^k] * [Sum_{k=0..n} C(n,k)^2 * (-x)^k].at n=5A249891
• First differences of number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 363", based on the 5-celled von Neumann neighborhood.at n=33A268194
• Square array A(n,k), n >= 0, k >= 0, read by antidiagonals, where column k is the expansion of e.g.f.: exp(Product_{j=1..n} 1/(1+x^j) - 1).at n=52A294289
• E.g.f.: exp(1/((1+x)*(1+x^2)) - 1).at n=7A294290