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A250313 as a simple table

na(n)
12
28
38
424
542
6104
7212
8464
9950
101968
113984
128072
1316226
1432600
1565324
16130848
17261870
18524000
191048232
202096792
214193882
228388168
2316776708
2433553904
2567108262
26134217104
27268434752
28536870184
291073741010
302147482808
314294966364

[2,8,8,24,42,104,212,464,950,1968,3984,8072,16226,
 32600,65324,130848,261870,524000,1048232,2096792,
 4193882,8388168,16776708,33553904,67108262,
 134217104,268434752,536870184,1073741010,
 2147482808,4294966364]