# A155596 (b-file synthesized from sequence entry)
0 1
1 4
2 22
3 118
4 610
5 3094
6 15562
7 77998
8 390370
9 1952614
10 9764602
11 48826078
12 244136530
13 1220694934
14 6103499242
15 30517545358
16 152587825090
17 762939322054
18 3814697003482
19 19073485803838
20 95367430592050
21 476837156105974