52020

Appears in sequences

• Number of ways of writing n as a sum of 10 squares.at n=8A000144
• Theta series of {D_10}^{+} lattice.at n=16A004532
• Number of nonseparable tree-rooted planar maps with n + 2 edges and 3 vertices.at n=14A006411
• Theta series of {D_10}* lattice.at n=16A008426
• Theta series of D_10 lattice.at n=4A008432
• Numbers k such that the sets of prime factors (ignoring multiplicity) of A000203(k) = sigma(k) and of A001157(k) = sigma_2(k) are identical.at n=6A081380
• Triangle T(n,k) read by rows: permutations on 123...n with one abc pattern and no aj pattern with j<=k, n>2, k<n-1.at n=37A084249
• Area under all paths in the first quadrant from (0,0) to (n,0) using steps U=(1,1), D=(1,-1), h=(1,0) and H=(2,0).at n=10A134424
• Numbers with prime factorization pq^2r^2s^2.at n=28A189344
• Number of n X 3 0..4 arrays with each element x equal to the number its horizontal and vertical neighbors equal to 4,3,2,1,0 for x=0,1,2,3,4.at n=9A197212
• Lower Pythagorean twins.at n=25A228876
• Denominators of Apéry's rational approximations p_n/q_n to zeta(3).at n=3A257045
• Expansion of (theta_3(z)*theta_3(23z) + theta_2(z)*theta_2(23z))^5.at n=24A328093
• a(n) is the number of subsets of {1..n} that contain exactly 4 odd and 1 even numbers.at n=35A333320
• Numbers that are both exponential and nonexponential abundant numbers.at n=17A348627
• Cubefree exponential abundant numbers: cubefree numbers k for which A051377(k) > 2*k.at n=37A391427