566845074703
domain: N
Appears in sequences
- Number of partitions of {1..2n} that are invariant under a permutation consisting of n 2-cycles.at n=14A002872
- Number of fixed points of permutation of SetPartitions under {1,2,...,n}->{n,n-1,...,1}. Number of symmetric arrangements of non-attacking rooks on upper half of n X n chessboard.at n=28A080107