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A228661 as a simple table

na(n)
12
22
38
414
538
680
7194
8434
91016
102318
115366
1212320
1328418
1465378
15150632
16346766
17798662
181838960
194234946
209751826
2122456664
2251712142
23119082134
24274218560
25631464962
261454120642
273348515528
287710877454
2917756424038
3040889056400

[2,2,8,14,38,80,194,434,1016,2318,5366,12320,
 28418,65378,150632,346766,798662,1838960,4234946,
 9751826,22456664,51712142,119082134,274218560,
 631464962,1454120642,3348515528,7710877454,
 17756424038,40889056400]