# A011958 (b-file synthesized from sequence entry)
1 1
2 1
3 3
4 8
5 22
6 68
7 216
8 728
9 2513
10 8920
11 32116
12 117240
13 431550
14 1600734
15 5970704
16 22381184
17 84236890
18 318191804
19 1205692236
20 4581481776
21 17452915218
22 66637798834
23 254960616136
24 977346581800
25 3753005281872