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A218236 as a simple table

n a(n)
1 3
2 15
3 63
4 255
5 1017
6 4065
7 16257
8 65025
9 260091
10 1040319
11 4161087
12 16643583
13 66571281
14 266272929
15 1065042945
16 4259976705
17 17039126547
18 68153385231
19 272601057663
20 1090354299903
21 4361217485769
22 17444071124289
23 69773089368321

[3,15,63,255,1017,4065,16257,65025,260091,1040319,
 4161087,16643583,66571281,266272929,1065042945,
 4259976705,17039126547,68153385231,272601057663,
 1090354299903,4361217485769,17444071124289,
 69773089368321]

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Last modified June 6 00:30 EDT 2024. Contains 373110 sequences. (Running on oeis4.)