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A054611 as a simple table

n a(n)
0 0
1 4
2 20
3 72
4 280
5 1040
6 4200
7 16408
8 65840
9 262296
10 1049680
11 4194344
12 16782000
13 67108912
14 268451960
15 1073744160
16 4295033440
17 17179869248
18 68719747320
19 274877907016
20 1099512679520
21 4398046544304
22 17592190238920
23 70368744177752

[0,4,20,72,280,1040,4200,16408,65840,262296,
 1049680,4194344,16782000,67108912,268451960,
 1073744160,4295033440,17179869248,68719747320,
 274877907016,1099512679520,4398046544304,
 17592190238920,70368744177752]

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Last modified April 23 07:16 EDT 2024. Contains 371905 sequences. (Running on oeis4.)