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A185561 as a simple table

na(n)
116
2900
350580
42842560
5159749820
68977824540
7504547256880
828355191537860
91593541291098420
1089555869973406240
115032975230384726780
12282849573983126145660
1315895941831670877597520
14893340453575999346503940

[16,900,50580,2842560,159749820,8977824540,
 504547256880,28355191537860,1593541291098420,
 89555869973406240,5032975230384726780,
 282849573983126145660,15895941831670877597520,
 893340453575999346503940]