# A144005 (b-file synthesized from sequence entry)
0 1
1 1
2 1
3 2
4 7
5 33
6 201
7 1479
8 12842
9 127952
10 1440989
11 18070767
12 249766088
13 3769280801
14 61654447712
15 1085974748430
16 20485430748783
17 411839042136379
18 8786499316562396
19 198174104269740313
20 4708919322491690592