# A156073 (b-file synthesized from sequence entry)
-1 1
0 2
1 5
2 20
3 130
4 1120
5 12080
6 156320
7 2360080
8 40721920
9 790465280
10 17048837120
11 404482209280
12 10468697374720
13 293526944276480
14 8863147657809920
15 286741939970836480
16 9895168120066539520
17 362814031120908615680
18 14085379571459949854720
19 577210378447729271111680