# A024851 (b-file synthesized from sequence entry)
2 2
3 5
4 12
5 30
6 77
7 200
8 522
9 1365
10 3572
11 9350
12 24477
13 64080
14 167762
15 439205
16 1149852
17 3010350
18 7881197
19 20633240