# A129817 (b-file synthesized from sequence entry)
0 1
1 0
2 1
3 1
4 2
5 6
6 24
7 102
8 528
9 2952
10 19008
11 131112
12 1009728
13 8271792
14 74167488
15 703077552
16 7194754368
17 77437418112
18 890643066048
19 10726837356672
20 136988469649728
21 1825110309733632
22 25625477737660608
23 374159217291201792
24 5728724202727533888
25 90961591766739121152
26 1508303564683904357568
27 25874345243221479539712
28 461932949559928514787648
29 8513674175717969079785472
30 162818666826944872460200128