# A149321 (b-file synthesized from sequence entry)
0 1
1 1
2 4
3 12
4 37
5 141
6 507
7 1889
8 7323
9 28670
10 112755
11 451118
12 1827782
13 7401042
14 30296921
15 124896792
16 515790235
17 2142127204
18 8938773789
19 37392751211
20 156893791500
21 660687389365
22 2788152813270
23 11790933187361
24 49993832732718
25 212360261584231
26 903547976751468
27 3851667878094158