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A189741 as a simple table

n a(n)
1 4
2 2
3 16
4 68
5 304
6 1352
7 6016
8 26768
9 119104
10 529952
11 2358016
12 10491968
13 46683904
14 207719552
15 924246016
16 4112423168
17 18298184704
18 81417585152
19 362266710016
20 1611902010368
21 7172141461504
22 31912369866752
23 141993762390016
24 631799789293568
25 2811186681954304

[4,2,16,68,304,1352,6016,26768,119104,529952,
 2358016,10491968,46683904,207719552,924246016,
 4112423168,18298184704,81417585152,362266710016,
 1611902010368,7172141461504,31912369866752,
 141993762390016,631799789293568,2811186681954304]

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Last modified April 23 16:40 EDT 2024. Contains 371916 sequences. (Running on oeis4.)