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A167532 as a simple table

na(n)
01
12
22
38
420
5112
6432
73200
816704
9154688
101017920
1111333888
1290011264
131172330496
1410908526592
15162802835456
161737036006400
1729235365490688
18351847501606912
196593866787569664
2088364197074231296
211825016315965767680

[1,2,2,8,20,112,432,3200,16704,154688,1017920,
 11333888,90011264,1172330496,10908526592,
 162802835456,1737036006400,29235365490688,
 351847501606912,6593866787569664,
 88364197074231296,1825016315965767680]