# A109154 (b-file synthesized from sequence entry)
0 1
1 2
2 4
3 14
4 56
5 262
6 1348
7 7574
8 45616
9 292442
10 1978788
11 14060654
12 104403304
13 807162070
14 6476169012
15 53781863598
16 461194543136
17 4075567775538
18 37048022605956
19 345883045698222
20 3311798037556952
21 32480125869403430