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A373874 as a simple table

na(n)
00
11
21
38
4142
54534
6229658
716951416
81718394312
9229119947280
1038881745126112
118183542269446928
122092128552508587360
13638590833851037194256
14229398149222697428624688
1595801846241560025353728512
1646025711723325944648182502016

[0,1,1,8,142,4534,229658,16951416,1718394312,
 229119947280,38881745126112,8183542269446928,
 2092128552508587360,638590833851037194256,
 229398149222697428624688,
 95801846241560025353728512,
 46025711723325944648182502016]