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A055360 as a simple table

na(n)
7120
84320
983628
101169768
1113329084
12131888624
131178097904
149745456704
1575988344096
16565644812320
174057808611860
1828255332957880
19192032572801508
201279389256340592
218384651931678936
2254203683325174736

[120,4320,83628,1169768,13329084,131888624,
 1178097904,9745456704,75988344096,565644812320,
 4057808611860,28255332957880,192032572801508,
 1279389256340592,8384651931678936,
 54203683325174736]