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A320350 as a simple table

na(n)
01
11
23
320
4148
51384
615728
7207696
83094152
951423288
10945943512
1119083180192
12418550811600
139907493349168
14251588827187280
156820899616891008
16196645361557479552
176007407711127690752
18193842462200078260224
196586904673329133618432
20235079477736802622742528
218790132360155070084076800

[1,1,3,20,148,1384,15728,207696,3094152,51423288,
 945943512,19083180192,418550811600,9907493349168,
 251588827187280,6820899616891008,
 196645361557479552,6007407711127690752,
 193842462200078260224,6586904673329133618432,
 235079477736802622742528,
 8790132360155070084076800]