19081066231
domain: N
Appears in sequences
- a(n) = (1/1 - 1/2 + ... + (-1)^(n-1)/n)*lcm{1..n}.at n=24A025530
- Numerators of coefficients in power series for -log(1+x)*log(1-x).at n=12A049281
- Numerator of the n-th alternating harmonic number, Sum_{k=1..n} (-1)^(k+1)/k.at n=24A058313
- Let u(1) = x and u(n+1) = (n^2/u(n)) + 1 for n >= 1; then a(n) is such that u(n) = (b(n)*x + c(n))/(a(n)*x + d(n)) (in lowest terms) and a(n), b(n), c(n), d(n) are positive integers.at n=25A075830
- Numerator of the product of n and the n-th alternating harmonic number, Sum_{k=1..n} (-1)^(k+1)/k.at n=24A119787
- Absolute value of numerator of the sum of all elements of the n X n matrix M with M[i,j] = (-1)^(i+j)*i/j for i,j = 1..n.at n=24A120301
- a(n) is the numerator of the n-th hyperharmonic number of order n.at n=12A354894