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A103896 as a simple table

na(n)
11
21
34
420
515700
6161520
7659739168
811887243200
9115875912594352
101360481062410358294032
1140999220870977029249072
121854483563489396099991763032000
13106016408292727234808287504322403328

[1,1,4,20,15700,161520,659739168,11887243200,
 115875912594352,1360481062410358294032,
 40999220870977029249072,
 1854483563489396099991763032000,
 106016408292727234808287504322403328]