# A115156 (b-file synthesized from sequence entry)
1 2
2 6
3 28
4 54
5 405
6 486
7 2808
8 4860
9 21870
10 40824
11 192456
12 524160
13 708588
14 4059072
15 14348907
16 58576608
17 123731712
18 462944160
19 1837080000
20 3874204890
21 11809800000
22 48183984000
23 65086642152
24 339033848832
25 1360965131136
26 2928898896840
27 6595446404736