-5560

Appears in sequences

• Bisection of A002470.at n=21A002286
• First differences of number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 347", based on the 5-celled von Neumann neighborhood.at n=39A271300
• a(n+3) = -a(n+2) - 2*a(n+1) + a(n) with a(0)=3, a(1)=-1, a(2)=-3.at n=17A276228
• a(n) = -a(n-1) + 2*a(n-2) + a(n-3), a(0) = -1, a(1) = -2, a(2) = -4.at n=16A321461
• E.g.f.: exp(exp(x) - 1) / (sec(x) + tan(x)).at n=9A337447