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A001508 as a simple table

na(n)
10
20
30
40
513
6252
73740
851300
9685419
109095856
11120872850
121614234960
1321697730835
14293695935764
154003423965684
1654944523689692
17758990230992175
1810548884795729280
19147458773053913268
202072369440050644208
2129271357456284966994

[0,0,0,0,13,252,3740,51300,685419,9095856,
 120872850,1614234960,21697730835,293695935764,
 4003423965684,54944523689692,758990230992175,
 10548884795729280,147458773053913268,
 2072369440050644208,29271357456284966994]