# A019254 (b-file synthesized from sequence entry)
3 1
4 0
5 4
6 8
7 4
8 16
9 30
10 60
11 192
12 428
13 966
14 2580
15 6310
16 15270
17 38844
18 97906
19 245106
20 622140
21 1579962
22 4022616
23 10300520
24 26418034
25 67838366
26 174898580
27 452444030
28 1173634490
29 3053711460
30 7968610458
31 20842301982