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A268966 as a simple table

na(n)
124
2240
32016
415552
5114048
6808704
75598720
838071296
9255301632
101693052928
1111125776384
1272559411200
13470184984576
143030081011712
1519434312695808
16124128835928064
17789910774087680
185010291195641856
1931686706480545792

[24,240,2016,15552,114048,808704,5598720,38071296,
 255301632,1693052928,11125776384,72559411200,
 470184984576,3030081011712,19434312695808,
 124128835928064,789910774087680,5010291195641856,
 31686706480545792]