# A165538 (b-file synthesized from sequence entry)
1 1
2 2
3 6
4 22
5 88
6 367
7 1568
8 6810
9 29943
10 132958
11 595227
12 2683373
13 12170778
14 55499358
15 254297805
16 1170248190
17 5406570910
18 25068420955
19 116617923611
20 544157590706
21 2546278167018
22 11945937322413
23 56180864428301