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A055304 as a simple table

na(n)
44
5140
63000
754600
8940800
916087680
10279417600
114989600000
1292207808000
131769511744000
1435321737651200
15733823266176000
1615866448998400000
17356873052856320000
188344427063132160000
19202660737281114112000

[4,140,3000,54600,940800,16087680,279417600,
 4989600000,92207808000,1769511744000,
 35321737651200,733823266176000,15866448998400000,
 356873052856320000,8344427063132160000,
 202660737281114112000]