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A307936 as a simple table

na(n)
13
2120
318792
47547904
56210432000
69116955648000
721746167511040000
878775578609057792000
9411821286886186942464000
102985318922218593845248000000
1129060162328471184917135360000000
12369984034079871408445744742400000000

[3,120,18792,7547904,6210432000,9116955648000,
 21746167511040000,78775578609057792000,
 411821286886186942464000,
 2985318922218593845248000000,
 29060162328471184917135360000000,
 369984034079871408445744742400000000]