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A347022 as a simple table

na(n)
01
11
25
350
4720
513650
6320370
78967720
8291538080
910795026840
10448484788680
1120658543923280
121044915105622800
1357572197848878400
143432143603792520000
15220109018869587398400
1615110184224165199667200
171105545474191480800492800
1885881534014930659599571200

[1,1,5,50,720,13650,320370,8967720,291538080,
 10795026840,448484788680,20658543923280,
 1044915105622800,57572197848878400,
 3432143603792520000,220109018869587398400,
 15110184224165199667200,1105545474191480800492800,
 85881534014930659599571200]