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A121880 as a simple table

na(n)
10
22
34
410
520
644
788
8182
9364
10738
111476
122972
135944
1411924
1523848
1647768
1795536
18191214
19382428
20765136
211530272
223061104
236122208
2412245530
2524491060
2648984342
2797968684
28195941804
29391883608
30783776080
311567552160
323135122038
336270244076

[0,2,4,10,20,44,88,182,364,738,1476,2972,5944,
 11924,23848,47768,95536,191214,382428,765136,
 1530272,3061104,6122208,12245530,24491060,
 48984342,97968684,195941804,391883608,783776080,
 1567552160,3135122038,6270244076]