# A179600 (b-file synthesized from sequence entry)
0 1
1 3
2 16
3 66
4 304
5 1332
6 5968
7 26472
8 117952
9 524496
10 2334400
11 10385568
12 46213120
13 205619520
14 914912512
15 4070872704
16 18113348608
17 80595074304
18 358607125504
19 1595618388480
20 7099688329216
21 31589989045248
22 140559334936576