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A086864 as a simple table

na(n)
10
20
30
41
530
6360
72970
819845
9115668
10612360
113018060
1214073345
1362788770
14270208224
151128426390
164594307445
1718302828040
1871553216240
19275154640632
201042806816225
213901324324230
2214427539010360
2352801538445810
24191427950399301
25688082033693340

[0,0,0,1,30,360,2970,19845,115668,612360,3018060,
 14073345,62788770,270208224,1128426390,4594307445,
 18302828040,71553216240,275154640632,
 1042806816225,3901324324230,14427539010360,
 52801538445810,191427950399301,688082033693340]