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A161807 as a simple table

n a(n)
0 3
1 27
2 111
3 378
4 1356
5 4131
6 10881
7 29106
8 73500
9 167643
10 382053
11 849339
12 1754061
13 3605094
14 7330311
15 14094945
16 26980563
17 51481332
18 93965784
19 170910270
20 311155296
21 545970024
22 955201653
23 1676274750
24 2849709768
25 4831999623

[3,27,111,378,1356,4131,10881,29106,73500,167643,
 382053,849339,1754061,3605094,7330311,14094945,
 26980563,51481332,93965784,170910270,311155296,
 545970024,955201653,1676274750,2849709768,
 4831999623]

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Last modified April 23 11:13 EDT 2024. Contains 371905 sequences. (Running on oeis4.)