-4043

Appears in sequences

• Expansion of sinh(sin(x))*sin(x)/2.at n=5A024232
• G.f. A(x) satisfies A(A(A(..(A(x))..))) = B(x) (13th self-COMPOSE of A) such that the coefficients of B(x) consist only of numbers {1,2,3,..,13}, with B(0) = 0.at n=4A112127
• a(n) = 7 + 12*n - 6*n^2.at n=27A157517
• First differences of number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 475", based on the 5-celled von Neumann neighborhood.at n=43A272450