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A007855 as a simple table

na(n)
11
23
313
463
5326
61769
79964
857843
9344203
102090470
1112912988
1280899801
13512896540
143284651548
1521217493460
16138080484819
17904454380446
185958186674879
1939448465279220
20262359379484522
211751912981641794
2211741044418866476

[1,3,13,63,326,1769,9964,57843,344203,2090470,
 12912988,80899801,512896540,3284651548,
 21217493460,138080484819,904454380446,
 5958186674879,39448465279220,262359379484522,
 1751912981641794,11741044418866476]