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A144894 as a simple table

na(n)
01
15
255
3485
44380
539570
6421800
74265100
849455000
9594001800
107784683200
11107814672000
121624964544000
1325881953328000
14443107288512000
158028628336512000
16154539996629760000
173135393617489280000
1867045955961922560000
191503619681171829760000
2035321502985569884160000

[1,5,55,485,4380,39570,421800,4265100,49455000,
 594001800,7784683200,107814672000,1624964544000,
 25881953328000,443107288512000,8028628336512000,
 154539996629760000,3135393617489280000,
 67045955961922560000,1503619681171829760000,
 35321502985569884160000]