# A203163 (b-file synthesized from sequence entry)
1 1
2 3
3 11
4 50
5 74
6 172
7 564
8 2400
9 2976
10 6528
11 20736
12 86400
13 100224
14 214272
15 670464
16 2764800
17 3096576
18 6524928
19 20238336
20 82944000
21 90906624
22 189775872
23 585252864
24 2388787200
25 2579890176
26 5350883328
27 16434855936
28 66886041600