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A115106 as a simple table

na(n)
01
14
212
320
4136
5392
61408
74544
815040
948896
10159232
11516608
121675264
135427200
1417575936
1556901632
16184188928
17596148224
181929379840
196244007936
2020206845952
2165392345088
22211617316864
23684814499840
242216119238656

[1,4,12,20,136,392,1408,4544,15040,48896,159232,
 516608,1675264,5427200,17575936,56901632,
 184188928,596148224,1929379840,6244007936,
 20206845952,65392345088,211617316864,684814499840,
 2216119238656]