login

A049388 as a simple table

na(n)
01
18
272
3720
47920
595040
61235520
717297280
8259459200
94151347200
1070572902400
111270312243200
1224135932620800
13482718652416000
1410137091700736000
15223016017416192000
165129368400572416000
17123104841613737984000
183077621040343449600000
1980018147048929689600000

[1,8,72,720,7920,95040,1235520,17297280,259459200,
 4151347200,70572902400,1270312243200,
 24135932620800,482718652416000,10137091700736000,
 223016017416192000,5129368400572416000,
 123104841613737984000,3077621040343449600000,
 80018147048929689600000]