# A026660 (b-file synthesized from sequence entry)
0 1
1 2
2 8
3 26
4 118
5 410
6 1946
7 6958
8 33764
9 122638
10 602972
11 2211946
12 10970256
13 40518606
14 202195920
15 750531666
16 3762558534
17 14019202506
18 70531575722
19 263582194126
20 1329868264538
21 4981772359258
22 25193088990806
23 94561764282118