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A223339 as a simple table

na(n)
1264
26696
3190740
45514360
5161370036
64730218284
7138947808456
84081817304888
9119957730775764
103525232400391672
11103605465347776488
123044880491450389068
1389488169170132234404
142630017284676266897204
1577295354555176007541020

[264,6696,190740,5514360,161370036,4730218284,
 138947808456,4081817304888,119957730775764,
 3525232400391672,103605465347776488,
 3044880491450389068,89488169170132234404,
 2630017284676266897204,77295354555176007541020]