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A275566 as a simple table

n a(n)
1 3
2 54
3 126
4 294
5 672
6 1536
7 3552
8 8214
9 19092
10 44376
11 103200
12 240000
13 558000
14 1297350
15 3015990
16 7011366
17 16299318
18 37891014
19 88085676
20 204773784
21 476041212
22 1106661366
23 2572675992
24 5980747104
25 13903551072
26 32321836896
27 75139155000

[3,54,126,294,672,1536,3552,8214,19092,44376,
 103200,240000,558000,1297350,3015990,7011366,
 16299318,37891014,88085676,204773784,476041212,
 1106661366,2572675992,5980747104,13903551072,
 32321836896,75139155000]

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Last modified April 24 10:11 EDT 2024. Contains 371935 sequences. (Running on oeis4.)