20800

Appears in sequences

• Theta series of D*_26 lattice.at n=6A022079
• Number of points of l_1 norm n in the "diamond" lattice D^+_4.at n=25A035878
• Numbers whose base-4 representation contains exactly four 0's and four 1's.at n=29A045037
• Number of nonempty subsets of {1,2,...,n} in which exactly 3/4 of the elements are <= (n-2)/2.at n=22A047186
• A049031/2.at n=32A049032
• a(n) = n*(n+1)*(n^2+5*n+18)/24.at n=24A051744
• a(n) = A000695(A014486(n)).at n=18A083931
• If X_1, ..., X_n is a partition of a 2n-set X into 2-blocks then a(n) is equal to the number of 3-subsets of X containing none of X_i, (i=1,...,n).at n=23A130809
• a(0) = 2, a(1) = 2, and for n > 1, a(n) = a(n-1) + a((a(n-1) - 1) mod n).at n=31A145465
• Difference between the cubes and 2*tetrahedral numbers; A000578(n) - 2*A000292(n).at n=32A146298
• a(n) = Sum_{d|n} d^phi(d).at n=11A174476
• Numbers with 42 divisors.at n=17A175750
• Numbers of the form p^6*q^2*r where p, q, and r are distinct primes.at n=16A179703
• Number of partitions of n containing a clique of size 6.at n=43A183563
• Number of (n+1) X 2 0..3 arrays with every 2 X 3 or 3 X 2 subblock having an unequal number of clockwise and counterclockwise edge increases.at n=2A207792
• Number of (n+1) X 4 0..3 arrays with every 2 X 3 or 3 X 2 subblock having an unequal number of clockwise and counterclockwise edge increases.at n=0A207794
• T(n,k) = Number of (n+1) X (k+1) 0..3 arrays with every 2 X 3 or 3 X 2 subblock having an unequal number of clockwise and counterclockwise edge increases.at n=3A207799
• T(n,k) = Number of (n+1) X (k+1) 0..3 arrays with every 2 X 3 or 3 X 2 subblock having an unequal number of clockwise and counterclockwise edge increases.at n=5A207799
• Number of (n+1) X (1+1) 0..2 arrays colored with the upper median value of each 2 X 2 subblock.at n=5A235947
• Number of (n+1) X (6+1) 0..2 arrays colored with the upper median value of each 2 X 2 subblock.at n=0A235952