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A108704 as a simple table

na(n)
01
11
24
318
4126
51110
612120
7156660
82341500
939701340
10752839920
1115785181720
12362606123880
139055825538760
14244296192460320
157079382509799600
16219321853964413200
177233629128601475600
18253054306933115688000
199358989706213886138400
20364860828050107348159200

[1,1,4,18,126,1110,12120,156660,2341500,39701340,
 752839920,15785181720,362606123880,9055825538760,
 244296192460320,7079382509799600,
 219321853964413200,7233629128601475600,
 253054306933115688000,9358989706213886138400,
 364860828050107348159200]