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A086347 as a simple table

na(n)
01
15
224
3116
4560
52704
613056
763040
8304384
91469696
107096320
1134264064
12165441536
13798822400
143857055744
1518623512576
1689922273280
17434183143424
182096421666816
1910122419240960
2048875363631104
21235991131488256
221139465980477440
235501828447862784

[1,5,24,116,560,2704,13056,63040,304384,1469696,
 7096320,34264064,165441536,798822400,3857055744,
 18623512576,89922273280,434183143424,
 2096421666816,10122419240960,48875363631104,
 235991131488256,1139465980477440,5501828447862784]