# A153910 (b-file synthesized from sequence entry)
0 1
1 2
2 1
3 2
4 5
5 6
6 10
7 46
8 45
9 144
10 630
11 1282
12 3589
13 31208
14 54740
15 306488
16 2365846
17 8422342
18 41318120
19 642228152
20 1995977194
21 19736350274
22 269164334206
23 1690170177698
24 14635326322042
25 402751016861848
26 2213195936856480