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A228655 as a simple table

na(n)
12
28
334
4140
5574
62348
79598
839224
9160282
10654944
112676202
1210935332
1344683222
14182581508
15746051878
163048465200
1712456425842
1850898577976
19207978216754
20849826072316
213472499977390
2214189087019740
2357978456949582

[2,8,34,140,574,2348,9598,39224,160282,654944,
 2676202,10935332,44683222,182581508,746051878,
 3048465200,12456425842,50898577976,207978216754,
 849826072316,3472499977390,14189087019740,
 57978456949582]