# A019080 (b-file synthesized from sequence entry)
3 0
4 1
5 3
6 9
7 11
8 25
9 49
10 149
11 266
12 587
13 1428
14 3157
15 7314
16 17592
17 41512
18 106222
19 261835
20 672519
21 1737880
22 4544713
23 11855007
24 31397844
25 82703872
26 219137228
27 580141297
28 1538683074
29 4079553827
30 10827431751