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A218759 as a simple table

na(n)
12
26
318
447
5134
6373
71035
82889
98050
1022420
1162477
12174072
13484983
141351277
153764915
1610489750
1729226504
1881430659
19226881448
20632135485
211761251171
224907184849
2313672362150
2438093833868
25106136756981
26295717444696

[2,6,18,47,134,373,1035,2889,8050,22420,62477,
 174072,484983,1351277,3764915,10489750,29226504,
 81430659,226881448,632135485,1761251171,
 4907184849,13672362150,38093833868,106136756981,
 295717444696]