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A138446 as a simple table

n a(n)
1 6
2 72
3 1560
4 11760
5 177144
6 482664
7 2413728
8 4704552
9 14803536
10 59482248
11 88750272
12 256572504
13 475010256
14 632136120
15 1077921312
16 2216435832
17 4218053016
18 5152037064
19 9045837768
20 12810027888
21 15133422096
22 24308744928

[6,72,1560,11760,177144,482664,2413728,4704552,
 14803536,59482248,88750272,256572504,475010256,
 632136120,1077921312,2216435832,4218053016,
 5152037064,9045837768,12810027888,15133422096,
 24308744928]

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Last modified October 18 00:21 EDT 2019. Contains 328135 sequences. (Running on oeis4.)