# A019181 (b-file synthesized from sequence entry)
3 0
4 1
5 4
6 2
7 6
8 26
9 34
10 96
11 274
12 562
13 1494
14 3780
15 8740
16 22468
17 56646
18 139246
19 357097
20 913238
21 2330588
22 6061420
23 15770773
24 41062072
25 107857272
26 283901367
27 748503924
28 1982727899
29 5265788481
30 14012697949
31 37393943801