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A373872 as a simple table

na(n)
00
11
20
31
415
5391
616275
7999391
885314915
99682617631
101411532175075
11257220473522431
1257317980108103715
1315338554965273810271
144855172557420679314275
151794588990417909081447871
16766066194581899382513514915
17374061220058388896558805473311

[0,1,0,1,15,391,16275,999391,85314915,9682617631,
 1411532175075,257220473522431,57317980108103715,
 15338554965273810271,4855172557420679314275,
 1794588990417909081447871,
 766066194581899382513514915,
 374061220058388896558805473311]