# A026991 (b-file synthesized from sequence entry)
0 1
1 2
2 6
3 20
4 98
5 502
6 2126
7 8382
8 39624
9 203562
10 922944
11 3886840
12 18431462
13 93930404
14 435553556
15 1893481706
16 9028569112
17 45794495192
18 214665970468
19 950426429104
20 4550599324520
21 23012148707800
22 108579819367298
23 486522336711212
24 2336288831626038
25 11788749319436714