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A235877 as a simple table

n a(n)
1 21
2 51
3 129
4 339
5 921
6 2571
7 7329
8 21219
9 62121
10 183291
11 543729
12 1618899
13 4832121
14 14447211
15 43243329
16 129533379
17 388206921
18 1163834331
19 3489930129
20 10466644659
21 31393642521
22 94168344651
23 282479868129
24 847389272739
25 2542067154921

[21,51,129,339,921,2571,7329,21219,62121,183291,
 543729,1618899,4832121,14447211,43243329,
 129533379,388206921,1163834331,3489930129,
 10466644659,31393642521,94168344651,282479868129,
 847389272739,2542067154921]

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Last modified August 16 21:21 EDT 2024. Contains 375191 sequences. (Running on oeis4.)