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A288206 as a simple table

na(n)
02
14
28
318
438
580
6164
7334
8674
91356
102720
115450
1210910
1321832
1443676
1587366
16174746
17349508
18699032
191398082
202796182
215592384
2211184788
2322369598
2444739218
2589478460
26178956944
27357913914
28715827854
291431655736
302863311500
315726623030
3211453246090

[2,4,8,18,38,80,164,334,674,1356,2720,5450,10910,
 21832,43676,87366,174746,349508,699032,1398082,
 2796182,5592384,11184788,22369598,44739218,
 89478460,178956944,357913914,715827854,1431655736,
 2863311500,5726623030,11453246090]