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A128656 as a simple table

na(n)
12
28
344
4240
51248
66224
730052
8141536
9653744
102973072
1113351192
1259333408
13261378944
141142885664
154965331028
1621452209600
1792230169232
18394819386896
191683663903016
207155148746912
2130313584232640
22128067598573408

[2,8,44,240,1248,6224,30052,141536,653744,2973072,
 13351192,59333408,261378944,1142885664,4965331028,
 21452209600,92230169232,394819386896,
 1683663903016,7155148746912,30313584232640,
 128067598573408]