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A320349 as a simple table

na(n)
01
11
25
332
4278
52894
635986
7514128
88306448
9149558688
102968216944
1164314676128
121510065781968
1338178537908016
141033794746169168
1529840453678758272
16914461132860063360
1729645845798652997120
181013511411165693991680
1936436289007997132646400
201373976152501162688288000

[1,1,5,32,278,2894,35986,514128,8306448,149558688,
 2968216944,64314676128,1510065781968,
 38178537908016,1033794746169168,29840453678758272,
 914461132860063360,29645845798652997120,
 1013511411165693991680,36436289007997132646400,
 1373976152501162688288000]