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A177605 as a simple table

na(n)
01
11
220
31680
4369600
5166923119
6134612399509
7176468898415460
8351456009607660440
91010384984894493146400
104028532188816344883922611
1121572165225621811583520157531
12151100918612288209338643024889160
131354217120536797195675961944817053840

[1,1,20,1680,369600,166923119,134612399509,
 176468898415460,351456009607660440,
 1010384984894493146400,4028532188816344883922611,
 21572165225621811583520157531,
 151100918612288209338643024889160,
 1354217120536797195675961944817053840]