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A206355 as a simple table

na(n)
12
2120
33284
491518
52545230
670894196
71973960628
854973461294
91530909659694
1042634040850720
111187302679649470
1233064936696401300
13920817809589881572
1425643653148853690776
15714144422751974649034
1619888051043349007713954

[2,120,3284,91518,2545230,70894196,1973960628,
 54973461294,1530909659694,42634040850720,
 1187302679649470,33064936696401300,
 920817809589881572,25643653148853690776,
 714144422751974649034,19888051043349007713954]