# A181137 (b-file synthesized from sequence entry)
1 3
2 9
3 27
4 78
5 228
6 666
7 1944
8 5676
9 16572
10 48384
11 141264
12 412440
13 1204176
14 3515760
15 10264752
16 29969376
17 87499776
18 255467808
19 745873920
20 2177683008
21 6358049472
22 18563212800
23 54197890560
24 158238305664
25 461998818048
26 1348870028544