# A005396 (b-file synthesized from sequence entry)
2 1
3 0
4 0
5 6
6 0
7 30
8 24
9 168
10 288
11 1170
12 2760
13 9504
14 25776
15 84006
16 244104
17 779970
18 2356800
19 7487310
20 23167656
21 73639326
22 231348000
23 737718534
24 2341772136
25 7498417956
26 23982456384
27 77119604400
28 248088123192
29 800978437674
30 2588744704560
31 8388692108016
32 27217694697000