# A019147 (b-file synthesized from sequence entry)
3 1
4 0
5 4
6 6
7 21
8 32
9 46
10 88
11 190
12 468
13 1046
14 2370
15 6015
16 12766
17 33972
18 81676
19 202255
20 504674
21 1275789
22 3206424
23 8249961
24 21031764
25 54337702
26 140377742
27 364430952
28 948642166
29 2473160606
30 6456496008
31 16874434634