# A135070 (b-file synthesized from sequence entry)
2 1
3 3
4 18
5 70
6 600
7 4956
8 52528
9 358128
10 6654600
11 79967800
12 1453049400
13 16239408120
14 392541718660
15 5252687631660
16 108961629396480
17 1395025456201408
18 62831427044385384
19 1223872353413404344