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A283049 as a simple table

n a(n)
0 0
1 4
2 48
3 480
4 4560
5 42504
6 393120
7 3624768
8 33390720
9 307618740
10 2835722032
11 26162863584
12 241614915360
13 2233533229200
14 20667453710400
15 191422799835264
16 1774573628661504
17 16465220088660432
18 152894968403313600
19 1420856831349155200
20 13213537097286612240

[0,4,48,480,4560,42504,393120,3624768,33390720,
 307618740,2835722032,26162863584,241614915360,
 2233533229200,20667453710400,191422799835264,
 1774573628661504,16465220088660432,
 152894968403313600,1420856831349155200,
 13213537097286612240]

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Last modified February 26 01:41 EST 2020. Contains 332270 sequences. (Running on oeis4.)