# A249512 (b-file synthesized from sequence entry)
0 1
1 1
2 3
3 7
4 15
5 33
6 75
7 169
8 375
9 835
10 1875
11 4203
12 9375
13 20931
14 46875
15 104919
16 234375
17 523737
18 1171875
19 2621545
20 5859375
21 13098001
22 29296875
23 65523597
24 146484375
25 327500413
26 732421875
27 1637918089