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A220456 as a simple table

na(n)
12
24
322
474
5250
6848
72851
89535
931888
10106775
11357028
121193927
133992279
1413348541
1544630321
16149215567
17498878032
181667898396
195576255601
2018642932177
2162328230082
22208379401186
23696665636518
242329130179184
257786871066006

[2,4,22,74,250,848,2851,9535,31888,106775,357028,
 1193927,3992279,13348541,44630321,149215567,
 498878032,1667898396,5576255601,18642932177,
 62328230082,208379401186,696665636518,
 2329130179184,7786871066006]