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A059420 as a simple table

na(n)
11
220
3616
428160
51805056
6154918400
717171485696
82389096202240
9407776690241536
1083793407533383680
1120407552701432856576
125813146553630295326720
131914890082050142493474816

[1,20,616,28160,1805056,154918400,17171485696,
 2389096202240,407776690241536,83793407533383680,
 20407552701432856576,5813146553630295326720,
 1914890082050142493474816]