# A104590 (b-file synthesized from sequence entry)
8 560
9 191520
10 42058800
11 7864256400
12 1407126890400
13 257752421166240
14 50607986220311520
15 10995419195575214400
16 2692773804667509763200
17 747221542837742897724800
18 233698171655650029030743040
19 81472765051132560093387934080
20 31268587126068905034073041062400