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A290378 as a simple table

na(n)
12
28
38
416
537
680
7156
8304
9602
101173
112290
124456
138686
1416892
1532833
1663776
17123864
18240524
19467060
20907061
211761894
223423164
236652706
2412933280
2525151787
2648931280
2795228360
28185400336
29361093444
30703546005
311371282460
322673742784
335215147858

[2,8,8,16,37,80,156,304,602,1173,2290,4456,8686,
 16892,32833,63776,123864,240524,467060,907061,
 1761894,3423164,6652706,12933280,25151787,
 48931280,95228360,185400336,361093444,703546005,
 1371282460,2673742784,5215147858]