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A069720 as a simple table

na(n)
11
26
340
4280
52016
614784
7109824
8823680
96223360
1047297536
11361181184
122769055744
1321300428800
14164317593600
151270722723840
169848101109760
1776467608616960
18594748067020800
194632774416793600
2036135640450990080
21282202144474398720
222206307674981662720
2317266755717247795200

[1,6,40,280,2016,14784,109824,823680,6223360,
 47297536,361181184,2769055744,21300428800,
 164317593600,1270722723840,9848101109760,
 76467608616960,594748067020800,4632774416793600,
 36135640450990080,282202144474398720,
 2206307674981662720,17266755717247795200]