# A050147 (b-file synthesized from sequence entry)
1 1
2 3
3 12
4 56
5 280
6 1452
7 7700
8 41456
9 225648
10 1238420
11 6840988
12 37986984
13 211842696
14 1185635388
15 6655993380
16 37463920608
17 211350457824
18 1194706644516
19 6765300359468
20 38370431711000
21 217931108199672