-1895
domain: Z
Appears in sequences
- Real part of Gaussian amicable numbers in order of increasing magnitude. See A102925 for the imaginary part.at n=1A102924
- Numerator of Bernoulli(n, -1/2).at n=10A157781
- 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=25A268194
- First differences of number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 313", based on the 5-celled von Neumann neighborhood.at n=25A271203
- a(n) = numerator((-2)^n*Sum_{k=0..n} binomial(n,k) * Bernoulli(k, 1/2)).at n=10A285866
- Expansion of Product_{k>=1} (1 - x^k)^(2*k-1).at n=21A319669
- a(1) = 1; a(n+1) = a(n) +- (sum of digits of a(1) up to a(n)), with "+" when a(n) is odd, or "-" if even.at n=34A332058
- a(n) = Numerator(-2*n*HurwitzZeta(1 - 2*n, -1/2)) for n > 0, and a(0) = 1.at n=5A335954
- a(n) = floor(f(n)), where f(n) = n^4*(15-24*n+10*n^2) + 20*n^5*(1-n)^3 / (1-2*n(1-n)).at n=4A356571