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A293007 as a simple table

n a(n)
0 0
1 0
2 2
3 4
4 12
5 32
6 88
7 240
8 656
9 1792
10 4896
11 13376
12 36544
13 99840
14 272768
15 745216
16 2035968
17 5562368
18 15196672
19 41518080
20 113429504
21 309895168
22 846649344
23 2313089024
24 6319476736
25 17265131520
26 47169216512
27 128868696064
28 352075825152
29 961889042432

[0,0,2,4,12,32,88,240,656,1792,4896,13376,36544,
 99840,272768,745216,2035968,5562368,15196672,
 41518080,113429504,309895168,846649344,2313089024,
 6319476736,17265131520,47169216512,128868696064,
 352075825152,961889042432]

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Last modified August 7 11:34 EDT 2020. Contains 336275 sequences. (Running on oeis4.)