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A020018 as a simple table

na(n)
01
10
20
30
41
53
615
791
8649
95253
1047802
11482796
125359036
1364844333
14849460756
1511977396665
16180858689642
172911824903230
1849792205845229
19901238925798638
2017213663482753993
21345994636003355265
227300486819670796088

[1,0,0,0,1,3,15,91,649,5253,47802,482796,5359036,
 64844333,849460756,11977396665,180858689642,
 2911824903230,49792205845229,901238925798638,
 17213663482753993,345994636003355265,
 7300486819670796088]