# A216681 (b-file synthesized from sequence entry)
0 1
1 1
2 3
3 17
4 85
5 333
6 1883
7 13153
8 76329
9 363033
10 2304867
11 17067553
12 104686957
13 534812789
14 3558451915
15 27086552833
16 170930393745
17 906063493617
18 6183676880195
19 47831931663921
20 307091159448965
21 1664876216837789
22 11545009017568635
23 90248125157828449