86800

Appears in sequences

• Number of exterior points formed by extending diagonals of n-gon in general position.at n=29A005701
• Number of regions in regular n-gon with all diagonals drawn.at n=39A007678
• Expansion of 1/((1-2x)(1-10x)(1-12x)).at n=4A016326
• Number of scalars which can be constructed from the Riemann tensor and metric tensor in n dimensions.at n=31A050297
• Numbers k such that sigma(k) divides k^2.at n=32A090777
• Number of 3 X 3 symmetric matrices over Z(n) having determinant 1.at n=9A115224
• a(n) = n*(n-1)*(n-2)*(n+3)/12.at n=32A117662
• Triangle T(n,k)=number of forests of labeled rooted trees of height at most 1, with n labels and k nodes, where any root may contain >= 1 labels, n >= 0, 0<=k<=n.at n=43A143397
• (A192469)/2.at n=7A192470
• Number of (w,x,y,z) with all terms in {1,...,n} and w<=2x and y<=3z.at n=19A212513
• Numbers such that the product of divisors of n is divisible by the product of divisors of sigma(n).at n=2A219363
• Number of (n+1)X(1+1) 0..2 arrays colored with the sum of the upper and lower median values of each 2X2 subblock.at n=4A236349
• Number of (n+1)X(5+1) 0..2 arrays colored with the sum of the upper and lower median values of each 2X2 subblock.at n=0A236353
• T(n,k)=Number of (n+1)X(k+1) 0..2 arrays colored with the sum of the upper and lower median values of each 2X2 subblock.at n=10A236354
• T(n,k)=Number of (n+1)X(k+1) 0..2 arrays colored with the sum of the upper and lower median values of each 2X2 subblock.at n=14A236354
• Number of length n+4 0..7 arrays with every five consecutive terms having two times the sum of some three elements equal to three times the sum of the remaining two.at n=6A248986
• Number of length 7+4 0..n arrays with every five consecutive terms having two times the sum of some three elements equal to three times the sum of the remaining two.at n=6A248994
• Integers n such that A249670(n) = n.at n=2A249671
• Number of n X 2 0..n*2-1 arrays with upper left zero and lower right n*2-1 and each element differing from its horizontal and diagonal neighbors by a power of two.at n=4A265615
• T(n,k) is the number of n X k 0..n*k-1 arrays with upper left zero and lower right n*k-1 and each element differing from its horizontal and diagonal neighbors by a power of two.at n=19A265619