# A059837 (b-file synthesized from sequence entry)
1 1
2 1
3 4
4 18
5 144
6 1200
7 14400
8 176400
9 2822400
10 45722880
11 914457600
12 18441561600
13 442597478400
14 10685567692800
15 299195895398400
16 8414884558080000
17 269276305858560000
18 8646761377013760000
19 311283409572495360000