# A019231 (b-file synthesized from sequence entry)
3 0
4 1
5 2
6 4
7 8
8 18
9 40
10 98
11 220
12 533
13 1374
14 3123
15 7891
16 20758
17 51623
18 134426
19 350099
20 896154
21 2334491
22 6080296
23 15820903
24 41484494
25 108963192
26 286929392
27 758672816
28 2009479756
29 5336446323
30 14205462811
31 37882139049