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A121257 as a simple table

na(n)
14
220
376
4260
5840
62616
77940
823644
969380
10201220
11578064
121647600
134664836
1413132580
1536789820
16102621956
17285174360
18789810984
192180889860
206005842540
2116498958324
2245225010180
23123715684896
24337806904800
25920819997700

[4,20,76,260,840,2616,7940,23644,69380,201220,
 578064,1647600,4664836,13132580,36789820,
 102621956,285174360,789810984,2180889860,
 6005842540,16498958324,45225010180,123715684896,
 337806904800,920819997700]