-491

Appears in sequences

• a(n+1) = a(n) - a(floor(n/2)), with a(0)=0, a(1)=1.at n=52A062187
• Expansion of (x - 1)/(1 - x^2 + x^3 + x^4 - x^5).at n=54A115413
• Primes or negative values of primes of the form 8*n^2 - 298*n + 2113 for n >= 0.at n=14A217439
• Primes or negative values of primes of the form 8*n^2 - 326*n + 2659 for n >= 0.at n=25A217440
• Expansion of e.g.f.: sin(r*x) / sqrt(1 + cos(r*x)^2) where r = sqrt(2), odd powers only.at n=3A263246
• First differences of number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 485", based on the 5-celled von Neumann neighborhood.at n=13A272505
• Expansion of exp( Sum_{n>=1} -sigma(6*n)*x^n/n ) in powers of x.at n=25A283164
• G.f.: 1/(1 + x/(1 + 2*x^2/(1 + 3*x^3/(1 + 4*x^4/(1 + 5*x^5/(1 + 6*x^6/(1 + ... ))))))), a continued fraction.at n=19A285409
• Expansion of Sum_{k>=0} x^(k*(k+1)/2) / Product_{j=1..k} (1 + j*x^j).at n=21A306704
• a(n) = -n^2 + 21*n - 1.at n=34A332884
• Square array T(n,k), n >= 1, k >= 0, read by antidiagonals downwards, where T(n,k) = Sum_{j=1..n} (-k)^(floor(n/j) - 1).at n=75A345033
• a(n) = Sum_{k=1..n} (-2)^(floor(n/k) - 1).at n=9A345034