# A162475 (b-file synthesized from sequence entry)
0 1
1 1
2 6
3 31
4 166
5 931
6 5412
7 32334
8 197378
9 1225871
10 7722282
11 49224175
12 316921948
13 2057994779
14 13463417108
15 88650225829
16 587062025226
17 3907415784953
18 26125388534522
19 175389933980744
20 1181803269037438
21 7989829660805193