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A039831 as a simple table

na(n)
11
22
34
413
557
6315
72057
815484
9132317
101261560
1113281295
12153218597
131921565205
1426008169266
15377922606876
165871153031163
1797096594212804
181702487540383101
1931551431772637772
20616331122530164638

[1,2,4,13,57,315,2057,15484,132317,1261560,
 13281295,153218597,1921565205,26008169266,
 377922606876,5871153031163,97096594212804,
 1702487540383101,31551431772637772,
 616331122530164638]