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A221397 as a simple table

n a(n)
1 0
2 6
3 30
4 144
5 672
6 3108
7 14328
8 65976
9 303672
10 1397520
11 6431136
12 29594352
13 136184256
14 626677152
15 2883768672
16 13270180608
17 61065117312
18 281002082880
19 1293081432192
20 5950345861248
21 27381582408576
22 126001256419584

[0,6,30,144,672,3108,14328,65976,303672,1397520,
 6431136,29594352,136184256,626677152,2883768672,
 13270180608,61065117312,281002082880,
 1293081432192,5950345861248,27381582408576,
 126001256419584]

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Last modified April 24 04:02 EDT 2024. Contains 371918 sequences. (Running on oeis4.)