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A018037 as a simple table

na(n)
01
13
28
321
458
5160
6441
71217
83357
99261
1025550
1170492
12194481
13536558
141480324
154084101
1611267725
1731086799
1885766121
19236622225
20652822777
211801088541
224969066720
2313709278307
2437822859361
25104350401111
26287894844440
27794280046581
282191358423329

[1,3,8,21,58,160,441,1217,3357,9261,25550,70492,
 194481,536558,1480324,4084101,11267725,31086799,
 85766121,236622225,652822777,1801088541,
 4969066720,13709278307,37822859361,104350401111,
 287894844440,794280046581,2191358423329]