2170680

Appears in sequences

• 5th forward differences of factorial numbers A000142.at n=5A001689
• Number of standard permutations of [ a_1..a_n b_1..b_n ] (b_i is not immediately followed by a_i, for all i).at n=5A033815
• Number of permutations of {1,2,...,n} that have no odd fixed points.at n=10A161131
• Number of permutations of {1,2,...,n} that have no even fixed points.at n=10A161132
• Triangle read by rows: T(n,k) is the number of permutations of {1,2,...,n} having exactly k odd fixed points (0 <= k <= ceiling(n/2)).at n=35A161133
• Triangle read by rows: T(n,k) is the number of permutations of {1,2,...,n} having exactly k even fixed points (0 <= k <= floor(n/2)).at n=30A161134
• Number of acyclic orientations of the Turán graph T(n,5).at n=10A267385
• Sixth column of Euler's difference table in A068106.at n=9A280425
• Number A(n,k) of acyclic orientations of the Turán graph T(k*n,n); square array A(n,k), n>=0, k>=1, read by antidiagonals.at n=33A372326