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A185047 as a simple table

na(n)
01
14
221
3126
4819
55616
640014
7293436
82200770
916805880
10130245570
111021926780
128102419470
1364819355760
14522606055815
154242331511910
1634645707347265
17284459491903860
182346790808206845
1919444838125142430
20161745698950048395
211350224965148230080

[1,4,21,126,819,5616,40014,293436,2200770,
 16805880,130245570,1021926780,8102419470,
 64819355760,522606055815,4242331511910,
 34645707347265,284459491903860,2346790808206845,
 19444838125142430,161745698950048395,
 1350224965148230080]