# A082526 (b-file synthesized from sequence entry)
0 1
1 1
2 1
3 2
4 3
5 12
6 40
7 120
8 2520
9 5040
10 10080
11 5040
12 19958400
13 19958400
14 259459200
15 518918400
16 2179457280
17 4358914560
18 1235025792000
19 3705077376000
20 422378820864000
21 52797352608000
22 120679663104000
23 844757641728000