login

A320758 as a simple table

na(n)
21
36
442
5330
62970
730240
8345240
94377240
1061122600
11933055200
1215470254800
13277005128400
145329454130000
15109681187616000
162404894892400000
1755977698400624000
181378748676601296000
1935829233832135744000
20979763376201049440000
2128124715476056399200000

[1,6,42,330,2970,30240,345240,4377240,61122600,
 933055200,15470254800,277005128400,5329454130000,
 109681187616000,2404894892400000,
 55977698400624000,1378748676601296000,
 35829233832135744000,979763376201049440000,
 28124715476056399200000]