7300804

Appears in sequences

• Square array T(M,N) read by antidiagonals: number of dimer tilings of a 2M x 2N Klein bottle.at n=42A103999
• a(n) is the number of perfect matchings of an edge-labeled 2 X n Klein bottle grid graph, or equivalently the number of domino tilings of a 2 X n Klein bottle grid. (The twist is on the length-n side.)at n=23A351635