# A108143 (b-file synthesized from sequence entry)
0 1
1 1
2 1
3 3
4 13
5 61
6 289
7 1371
8 6505
9 30865
10 146449
11 694875
12 3297061
13 15643981
14 74227969
15 352198803
16 1671122065
17 7929183553
18 37622596897
19 178512678867
20 847011613885
21 4018922793661
22 19069089675553
23 90479513970219