# A275541 (b-file synthesized from sequence entry)
0 0
1 0
2 1
3 6
4 25
5 126
6 733
7 5086
8 40423
9 363262
10 3629743
11 39920638
12 479011993
13 6227066878
14 87178426333
15 1307675013118
16 20922791915023
17 355687438417918
18 6402373740187423
19 121645100594626558
20 2432902008831369073