# A162921 (b-file synthesized from sequence entry)
0 1
1 4
2 12
3 36
4 102
5 288
6 816
7 2304
8 6510
9 18396
10 51972
11 146844
12 414894
13 1172232
14 3312024
15 9357768
16 26439366
17 74701620
18 211061436
19 596331540
20 1684871094
21 4760423280
22 13450067520
23 38001729168
24 107369826654
25 303361976844