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A087438 as a simple table

na(n)
01
14
215
356
4212
5816
63184
712544
849728
9197888
10789248
113151872
1212596224
1350360320
14201388032
15805437440
163221504000
1712885491712
1851540852736
19206161051648
20824639225856
213298546417664
2213194163650560
2352776608464896

[1,4,15,56,212,816,3184,12544,49728,197888,789248,
 3151872,12596224,50360320,201388032,805437440,
 3221504000,12885491712,51540852736,206161051648,
 824639225856,3298546417664,13194163650560,
 52776608464896]