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A087547 as a simple table

na(n)
00
11
24
322
4160
51464
616224
7211632
83179520
954092160
101028113920
1121594021120
12496702402560
1312418039065600
14335293281792000
159723592350259200
16301432670532403200
179947299050359193600
18348155822449999872000
1912881771833023700992000
20502389223133024747520000

[0,1,4,22,160,1464,16224,211632,3179520,54092160,
 1028113920,21594021120,496702402560,
 12418039065600,335293281792000,9723592350259200,
 301432670532403200,9947299050359193600,
 348155822449999872000,12881771833023700992000,
 502389223133024747520000]