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A226978 as a simple table

na(n)
11
22
32
44
54
612
78
844
932
10228
11148
121632
13912
1416004
158420
16213680
17101508
183933380
191691008
2098949060
2138742844
223413919788
231213540776
24161410887252
2552106993880

[1,2,2,4,4,12,8,44,32,228,148,1632,912,16004,8420,
 213680,101508,3933380,1691008,98949060,38742844,
 3413919788,1213540776,161410887252,52106993880]