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A101609 as a simple table

n a(n)
1 0
2 2
3 6
4 36
5 180
6 1320
7 9240
8 84000
9 756000
10 8285760
11 91143360
12 1173553920
13 15256200960
14 226040855040
15 3390612825600
16 56865153945600
17 966707617075200
18 18112111963545600
19 344130127307366400
20 7125892746964992000

[0,2,6,36,180,1320,9240,84000,756000,8285760,
 91143360,1173553920,15256200960,226040855040,
 3390612825600,56865153945600,966707617075200,
 18112111963545600,344130127307366400,
 7125892746964992000]

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Last modified July 13 15:41 EDT 2024. Contains 374284 sequences. (Running on oeis4.)