6044482889

Appears in sequences

• Number of 2-factors in P_8 X P_n.at n=8A145417
• Number of ways to cover the n X n+1 grid graph by vertex disjoint cycles.at n=6A222203
• Write n=3i+j, 0<=j<3; a(n) = number of ways to cover the r X s grid graph by vertex disjoint cycles, where (r,s) = (2i+2, 2i+2) (if j=0), (2i+2, 2i+3) (if j=1) or (2i+3, 2i+4) (if j=2).at n=10A222204