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A100320 as a simple table

na(n)
01
14
212
340
4140
5504
61848
76864
825740
997240
10369512
111410864
125408312
1320801200
1480233200
15310235040
161202160780
174667212440
1818150270600
1970690527600
20275693057640
211076515748880
224208197927440
2316466861455200
2464495207366200
25252821212875504
26991837065896208

[1,4,12,40,140,504,1848,6864,25740,97240,369512,
 1410864,5408312,20801200,80233200,310235040,
 1202160780,4667212440,18150270600,70690527600,
 275693057640,1076515748880,4208197927440,
 16466861455200,64495207366200,252821212875504,
 991837065896208]