# A274492 (b-file synthesized from sequence entry)
2 1
3 1
4 5
5 16
6 52
7 170
8 556
9 1821
10 5973
11 19620
12 64536
13 212553
14 700903
15 2313864
16 7646670
17 25294673
18 83748689
19 277518319
20 920332567
21 3054319120
22 10143305864
23 33707066667
24 112078220233
25 372875904038
26 1241182355688
27 4133534991928
28 13772413826888
29 45908128269573