# A037683 (b-file synthesized from sequence entry)
1 1
2 6
3 39
4 236
5 1417
6 8502
7 51015
8 306092
9 1836553
10 11019318
11 66115911
12 396695468
13 2380172809
14 14281036854
15 85686221127
16 514117326764
17 3084703960585
18 18508223763510
19 111049342581063
20 666296055486380
21 3997776332918281