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A128941 as a simple table

n a(n)
0 4
1 28
2 138
3 629
4 2784
5 12134
6 52366
7 224404
8 956514
9 4060036
10 17175130
11 72454073
12 304941384
13 1280898302
14 5371301502
15 22491017756
16 94055344242
17 392888085098
18 1639534704630
19 6835739258996
20 28477594607346
21 118551827347574

[4,28,138,629,2784,12134,52366,224404,956514,
 4060036,17175130,72454073,304941384,1280898302,
 5371301502,22491017756,94055344242,392888085098,
 1639534704630,6835739258996,28477594607346,
 118551827347574]

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Last modified June 9 18:31 EDT 2024. Contains 373248 sequences. (Running on oeis4.)