# A027140 (b-file synthesized from sequence entry)
0 1
1 3
2 12
3 57
4 264
5 1261
6 6141
7 30276
8 150853
9 758145
10 3836896
11 19534086
12 99957904
13 513756551
14 2650822585
15 13724435509
16 71275344341
17 371177285715
18 1937791196448
19 10139548682524
20 53165765660928
21 279301910804937