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A001335 as a simple table

n a(n)
0 1
1 0
2 0
3 12
4 24
5 60
6 180
7 588
8 1968
9 6840
10 24240
11 87252
12 318360
13 1173744
14 4366740
15 16370700
16 61780320
17 234505140
18 894692736
19 3429028116
20 13195862760
21 50968206912
22 197517813636
23 767766750564
24 2992650987408
25 11694675166500
26 45807740881032

[1,0,0,12,24,60,180,588,1968,6840,24240,87252,
 318360,1173744,4366740,16370700,61780320,
 234505140,894692736,3429028116,13195862760,
 50968206912,197517813636,767766750564,
 2992650987408,11694675166500,45807740881032]

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Last modified June 7 20:29 EDT 2024. Contains 373206 sequences. (Running on oeis4.)