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A268470 as a simple table

na(n)
11
24
336
4648
519800
6972000
769060600
86756825600
9866219961600
10140837901120000
1128269530815680000
126865910948635200000

[1,4,36,648,19800,972000,69060600,6756825600,
 866219961600,140837901120000,28269530815680000,
 6865910948635200000]