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A155521 as a simple table

na(n)
00
11
21
37
431
5191
61331
710655
895887
9958879
1010547659
11126571919
121645434935
1323036089103
14345541336531
155528661384511
1693987243536671
171691770383660095
1832143637289541787
19642872745790835759
2013500327661607550919

[0,1,1,7,31,191,1331,10655,95887,958879,10547659,
 126571919,1645434935,23036089103,345541336531,
 5528661384511,93987243536671,1691770383660095,
 32143637289541787,642872745790835759,
 13500327661607550919]