# A318004 (b-file synthesized from sequence entry)
0 1
1 1
2 3
3 23
4 249
5 3601
6 65163
7 1420103
8 36240369
9 1060638241
10 35030837523
11 1289122462583
12 52311218246889
13 2320745189970481
14 111753587921091483
15 5805372695984119463
16 323619830261141155809
17 19269740737912396000321
18 1220661620760214878827043
19 81966845938603736180310743
20 5815923258824904181135143129