84091

Appears in sequences

• Triangle read by rows: T(n,k) is the number of cycle-up-down permutations of {1,2,...,n} having k fixed points (0 <= k <= n). A permutation is said to be cycle-up-down if it is a product of up-down cycles. A cycle (b(1), b(2), ...) is said to be up-down if, when written with its smallest element in the first position, it satisfies b(1) < b(2) > b(3) < ... .at n=55A186363
• Number of cycle-up-down permutations of {1,2,...,n} having no fixed points. A permutation is said to be cycle-up-down if it is a product of up-down cycles. A cycle (b(1), b(2), ...) is said to be up-down if, when written with its smallest element in the first position, it satisfies b(1)<b(2)>b(3)<... .at n=10A186364
• Composite squarefree numbers n such that p(i)-5 divides n+5, where p(i) are the prime factors of n.at n=22A225705
• Main diagonal of Ludic array A255127 (and A255129): a(n) = A255127(n,n).at n=42A255410