# A141084 (b-file synthesized from sequence entry)
1 1
2 2
3 2
4 18
5 228
6 1068
7 3696
8 11046
9 30390
10 77976
11 190978
12 455166
13 1063452
14 2445450
15 5561658
16 12522478
17 27987780
18 62097646
19 136990768
20 300684322