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A186418 as a simple table

na(n)
01
14
2144
310000
4960400
5112021056
614876193024
72167749739584
8338710896810000
955880440123393600
109629613008027474176
111719721549507980904704
12316402760115623198128384
1359700436261400947600000000

[1,4,144,10000,960400,112021056,14876193024,
 2167749739584,338710896810000,55880440123393600,
 9629613008027474176,1719721549507980904704,
 316402760115623198128384,
 59700436261400947600000000]