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A030940 as a simple table

na(n)
12
24
312
449
5248
61489
710429
883439
9750954
107509543
1182604983
12991259805
1312886377471
14180409284603
152706139269054
1643298228304877
17736069881182916
1813249257861292497
19251735899364557450
205034717987291149011

[2,4,12,49,248,1489,10429,83439,750954,7509543,
 82604983,991259805,12886377471,180409284603,
 2706139269054,43298228304877,736069881182916,
 13249257861292497,251735899364557450,
 5034717987291149011]