# A143557 (b-file synthesized from sequence entry)
0 1
1 1
2 8
3 32
4 280
5 1728
6 16744
7 117856
8 1202552
9 9044352
10 95203784
11 745451168
12 8011827928
13 64459117632
14 703166465320
15 5769038826208
16 63639465830712
17 529889242505984
18 5896324892061576
19 49665617425122592
20 556508207889107096