# A077821 (b-file synthesized from sequence entry)
0 1
1 4
2 16
3 64
4 253
5 1000
6 3952
7 15616
8 61705
9 243820
10 963424
11 3806848
12 15042277
13 59437648
14 234860320
15 928020736
16 3666956113
17 14489511508
18 57253465072
19 226229798080
20 893918323981
21 3532204761400
22 13957058650384
23 55149545207296
24 217916425857241
25 861069089144764