# A092970 (b-file synthesized from sequence entry)
1 2
2 2
3 3
4 7
5 31
6 181
7 1009
8 13441
9 45361
10 453601
11 3991681
12 39916801
13 566092801
14 10897286401
15 130767436801
16 2988969984001
17 25406244864001
18 0
19 8109673360588801
20 304112751022080001
21 2688996956405760001