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A346890 as a simple table

na(n)
01
10
20
30
41
55
615
735
8140
91386
1012810
1192730
12589545
134234945
1441832791
15483334215
165401798220
1757262207380
18626438655900
197740130412796
20107197808258745
211546730804858085
2222360919412385015
23329241486278715395
245121840342205301946

[1,0,0,0,1,5,15,35,140,1386,12810,92730,589545,
 4234945,41832791,483334215,5401798220,57262207380,
 626438655900,7740130412796,107197808258745,
 1546730804858085,22360919412385015,
 329241486278715395,5121840342205301946]