# A162560 (b-file synthesized from sequence entry)
-1 3
0 8
1 30
2 132
3 612
4 2880
5 13608
6 64368
7 304560
8 1441152
9 6819552
10 32270400
11 152705088
12 722608128
13 3419418240
14 16180860672
15 76568654592
16 362326763520
17 1714548653568
18 8113331340288
19 38392696120320
20 181676188680192