# A218250 (b-file synthesized from sequence entry)
0 1
1 1
2 3
3 7
4 18
5 49
6 135
7 383
8 1104
9 3228
10 9554
11 28557
12 86095
13 261487
14 799323
15 2457327
16 7592620
17 23565444
18 73437284
19 229691620
20 720800824
21 2268820824
22 7161255962
23 22661307317
24 71878917199
25 228487568175
26 727779875401
27 2322485254421
28 7424488376794
29 23773398866825