# A004349 (b-file synthesized from sequence entry)
7 1
8 40
9 990
10 19600
11 341055
12 5461512
13 82598880
14 1198774720
15 16871053725
16 231900297200
17 3129162672636
18 41604694413840
19 546585072715045
20 7110542499799200
21 91748617512913200
22 1175759825268299040