# A006772 (b-file synthesized from sequence entry)
1 0
2 1
3 3
4 14
5 70
6 370
7 2028
8 11452
9 66172
10 389416
11 2326202
12 14070268
13 86010680
14 530576780
15 3298906810
16 20653559846
17 130099026600
18 823979294284
19 5244162058026
20 33523117491920
21 215150177410088
22 1385839069134800
23 8956173544332434
24 58056703069399056
25 377396656568011618
26 2459614847765495754
27 16068572108927106202