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A163277 as a simple table

na(n)
00
12
2576
317496
4204800
51406250
66858432
726353376
884934656
9239148450
10605000000
111403076312
123027787776
136149354666
1411859019200
1521870000000
1638788923392
1766474865026
18110505715776
19178774347800
20282240000000

[0,2,576,17496,204800,1406250,6858432,26353376,
 84934656,239148450,605000000,1403076312,
 3027787776,6149354666,11859019200,21870000000,
 38788923392,66474865026,110505715776,178774347800,
 282240000000]