20326

Appears in sequences

• Numbers k such that sigma(k) = sigma(k+5).at n=9A015865
• Inverse binomial transform of A002054.at n=9A035045
• Consecutive terms of A065966 which are also consecutive integers.at n=32A065976
• Coefficient of q^1 in nu(n), where nu(0)=1, nu(1)=b and, for n>=2, nu(n)=b*nu(n-1)+lambda*(1+q+q^2+...+q^(n-2))*nu(n-2) with (b,lambda)=(1,2).at n=13A074352
• Expansion of 1/sqrt(1-4*x-8*x^2+32*x^3).at n=8A106184
• Triangle of coefficients of polynomials u(n,x) jointly generated with A210756; see the Formula section.at n=40A210755
• G.f.: 1 + Sum_{n>=1} a(n)*x^n/(1 - x^n) = Product_{n>=1} 1/(1 - n*x^n).at n=15A300277
• Square array T(n,k), n >= 0, k >= 0, read by antidiagonals downwards, where T(n,k) = n! * Sum_{j=0..n} binomial(n+(k-1)*j,k*j)/j!.at n=50A361600
• Array read by antidiagonals: T(n,k) is the number of {-1,0,1} n X k matrices with all rows and columns summing to zero up to permutations of rows.at n=59A377063
• Number of 4 X n 0..2 matrices with row sums n and column sums 4 up to permutations of rows.at n=6A377066