505210

Appears in sequences

• Euler transform of 4 3 2 1 1 1 1 1 1 1 ...at n=22A029860
• Number of fixed points in all cycle-up-down permutations of {1,2,...,n}.at n=10A186365
• Triangle with Euler (secant) numbers, read by rows, T(n, k) for 0 <= k <= n.at n=18A326724