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A266050 as a simple table

na(n)
12
212
320
454
5120
6284
7660
81540
93592
108376
1119536
1245560
13106256
14247808
15577936
161347856
173143456
187331136
1917097600
2039874848
2192995712
22216883648
23505813824
241179653824
252751176576
266416265856
2714963949568
2834898770048
2981390554368

[2,12,20,54,120,284,660,1540,3592,8376,19536,
 45560,106256,247808,577936,1347856,3143456,
 7331136,17097600,39874848,92995712,216883648,
 505813824,1179653824,2751176576,6416265856,
 14963949568,34898770048,81390554368]