53200

Appears in sequences

• Expansion of 1/((1+x)*(1-x)^5).at n=37A001752
• Zeroth correlation moment for 4-d b.c.c. lattice.at n=3A010559
• Cycle class sequence c(n) (the number of true cycles of length n in which a certain node is included) for zeolite DAC = Dachiardite Na5[Al5Si19O48].12H2O starting with a T3 atom.at n=14A019104
• Numbers n such that n divides the (right) concatenation of all numbers <= n written in base 13 (most significant digit on right).at n=21A029506
• Even numbers k such that the central binomial coefficient A000984(k, k/2) is divisible by k^2.at n=30A080395
• Map from binary trees of size n to the set of corresponding trivalent plane trees (tpt) represented as size 2n+1 general trees.at n=23A083930
• a(n) = n^2*(n^2 - 1)/3.at n=20A112742
• The Wiener index of the P_3 X P_n grid, where P_m is the path graph on m nodes. The Wiener index of a connected graph is the sum of distances between all unordered pairs of nodes in the graph.at n=31A180569
• Number of (n+1)X(3+1) 0..3 arrays with the sum of all four elements of every 2X2 subblock equal.at n=4A237010
• Number of (n+1)X(5+1) 0..3 arrays with the sum of all four elements of every 2X2 subblock equal.at n=2A237012
• T(n,k)=Number of (n+1)X(k+1) 0..3 arrays with the sum of all four elements of every 2X2 subblock equal.at n=23A237015
• T(n,k)=Number of (n+1)X(k+1) 0..3 arrays with the sum of all four elements of every 2X2 subblock equal.at n=25A237015
• 25-gonal pyramidal numbers: a(n) = n*(n+1)*(23*n-20)/6.at n=24A256645
• Numerator of n*Product_{j=1..n-1} ((3*j + 1)/(3*j + 2)).at n=9A271921
• Lesser of amicable pair m < n defined by t(n) = m and t(m) = n where t(n) = psi(n) - n and psi(n) = A001615(n) is the Dedekind psi function.at n=23A323329
• Triangle read by rows where T(n,k) is the number of labeled simple graphs covering n vertices with exactly k endpoints (vertices of degree 1).at n=31A327377
• The number of n X n replace matrices: binary matrices A where the i-th row contains exactly i zeros and A[i,j] >= A[j,i] for all i < j.at n=5A332637
• Numbers that are the sum of four third powers in nine or more ways.at n=15A345146
• Numbers that are the sum of four third powers in ten or more ways.at n=7A345155
• Numbers that are the sum of four third powers in exactly ten ways.at n=5A345156