# A051195 (b-file synthesized from sequence entry)
0 0
1 4
2 12
3 56
4 200
5 792
6 2968
7 11440
8 43632
9 167960
10 646184
11 2496144
12 9655984
13 37442160
14 145416240
15 565722720
16 2203937120
17 8597496600
18 33577908232
19 131282408400
20 513791254704
21 2012616400080
22 7890369761872
23 30957699535776