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A219668 as a simple table

n a(n)
1 4
2 26
3 56
4 90
5 122
6 568
7 2042
8 8186
9 32762
10 37432
11 68652
12 299576
13 2097146
14 8388602
15 19173944
16 33554426
17 67751984
18 78536544824
19 306296525088
20 15640174780344
21 39998905951528
22 120948840863188

[4,26,56,90,122,568,2042,8186,32762,37432,68652,
 299576,2097146,8388602,19173944,33554426,67751984,
 78536544824,306296525088,15640174780344,
 39998905951528,120948840863188]

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Last modified June 11 02:07 EDT 2024. Contains 373288 sequences. (Running on oeis4.)