# A123357 (b-file synthesized from sequence entry)
0 1
1 6
2 40
3 272
4 1856
5 12672
6 86528
7 590848
8 4034560
9 27549696
10 188121088
11 1284571136
12 8771600384
13 59896233984
14 408997068800
15 2792806678528
16 19070476877824
17 130221361594368
18 889207077732352
19 6071885729103872
20 41461429210972160
21 283116347854946304
22 1933239349151793152