# A089387 (b-file synthesized from sequence entry)
0 1
1 1
2 2
3 8
4 36
5 164
6 764
7 3652
8 17852
9 88868
10 449004
11 2296692
12 11870316
13 61897140
14 325239036
15 1720415268
16 9154052700
17 48961321604
18 263092909004
19 1419630359572
20 7689097400588
21 41788586179988
22 227819374037340
23 1245545102522948