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A337906 as a simple table

na(n)
21
36
434
5200
61095
76230
834636
9195552
101099140
116218520
1235210736
13200099328
141139401263
156504768270
1637211008120
17213311576192
181225053737622
197047867363108
2040612374024300
21234376628718960
221354498970905080
237838134441085520
2445412879702456800
25263417461793120000

[1,6,34,200,1095,6230,34636,195552,1099140,
 6218520,35210736,200099328,1139401263,6504768270,
 37211008120,213311576192,1225053737622,
 7047867363108,40612374024300,234376628718960,
 1354498970905080,7838134441085520,
 45412879702456800,263417461793120000]