-1516

Appears in sequences

• a(n) = A138906(n) - A138905(n).at n=22A138907
• Expansion of (psi(x^3) / psi(x))^2 in powers of x where psi() is a Ramanujan theta function.at n=21A217786
• First differences of number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 3", based on the 5-celled von Neumann neighborhood.at n=19A269913
• a(n) = 4^n * [x^n] Product_{k>=1} (1 + 2*x^k)^(1/4).at n=6A370736
• E.g.f. A(x) satisfies A(x) = exp( -x * A(-x*A(x)) ).at n=5A384757
• Square array A(n,k), n >= 0, k >= 0, read by antidiagonals downwards, where column k is the expansion of e.g.f. B(x)^k, where B(x) is the e.g.f. of A384757.at n=26A384758