205952

Appears in sequences

• Number of permutations of n elements with an even number of fixed points.at n=9A062282
• Number of graph endomorphisms of undirected cycles of even length: |End(C_2n)|.at n=7A112850
• Number of edge cuts in the n-triangular grid graph.at n=3A377772
• Total number of runs of 1's in all length n binary words in which 1's occur in runs of at least 3.at n=23A387573