# A209866 (b-file synthesized from sequence entry)
0 1
1 1
2 1
3 1
4 2
5 5
6 24
7 26
8 672
9 246
10 3755388
11 13827240
12 1768910220
13 99034598880
14 1463488641762840
15 612823600
16 171768365608799778
17 16338317307187487976
18 27491145139913884194480
19 14794457633180140325810400
20 2084886621890359572790082258379649440