login

A001805 as a simple table

na(n)
36
496
51200
614400
7176400
82257920
930481920
10435456000
116586272000
12105380352000
131780927948800
1431732897996800
15594991837440000
1611716762337280000
17241867451105280000
185224336943874048000
19117874102296158208000
202773508289321369600000

[6,96,1200,14400,176400,2257920,30481920,
 435456000,6586272000,105380352000,1780927948800,
 31732897996800,594991837440000,11716762337280000,
 241867451105280000,5224336943874048000,
 117874102296158208000,2773508289321369600000]