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A055663 as a simple table

na(n)
9220
104004
1143680
12371280
132713200
1417907120
15109830336
16637408200
173543239700
1819028509500
1999348849600
20506679132960
212533395664800
2212454385680800
2360338017584000
24288616850776800
251365157704174264
266393385628146440
2729677938224482240
28136674715507484000

[220,4004,43680,371280,2713200,17907120,109830336,
 637408200,3543239700,19028509500,99348849600,
 506679132960,2533395664800,12454385680800,
 60338017584000,288616850776800,1365157704174264,
 6393385628146440,29677938224482240,
 136674715507484000]