# A115081 (b-file synthesized from sequence entry)
0 1
1 1
2 3
3 11
4 50
5 257
6 1467
7 9081
8 60272
9 424514
10 3151226
11 24510411
12 198870388
13 1676878231
14 14648843341
15 132228263355
16 1230505582380
17 11782173683640
18 115878367974480
19 1168833058344870
20 12075008262774120
21 127608480923659770