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A262973 as a simple table

n a(n)
1 0
2 2
3 36
4 624
5 11800
6 248400
7 5817084
8 150660608
9 4285808496
10 133010784000
11 4475982692500
12 162419627132928
13 6324111407554824
14 263067938335913984
15 11645155099754347500
16 546652030933421260800
17 27126781579050558916576
18 1418971858887930496745472

[0,2,36,624,11800,248400,5817084,150660608,
 4285808496,133010784000,4475982692500,
 162419627132928,6324111407554824,
 263067938335913984,11645155099754347500,
 546652030933421260800,27126781579050558916576,
 1418971858887930496745472]

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Last modified July 23 14:59 EDT 2017. Contains 289688 sequences.