login

A215223 as a simple table

na(n)
14
212
324
472
5120
6408
7840
82448
95760
1015960
1139864
12108024
13275184
14728784
151895760
164998528
1713033560
1834250904
1989602632
20235157640
21615871032

[4,12,24,72,120,408,840,2448,5760,15960,39864,
 108024,275184,728784,1895760,4998528,13033560,
 34250904,89602632,235157640,615871032]