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A026551 as a simple table

n a(n)
0 3
1 9
2 21
3 57
4 129
5 345
6 777
7 2073
8 4665
9 12441
10 27993
11 74649
12 167961
13 447897
14 1007769
15 2687385
16 6046617
17 16124313
18 36279705
19 96745881
20 217678233
21 580475289
22 1306069401
23 3482851737
24 7836416409
25 20897110425
26 47018498457

[3,9,21,57,129,345,777,2073,4665,12441,27993,
 74649,167961,447897,1007769,2687385,6046617,
 16124313,36279705,96745881,217678233,580475289,
 1306069401,3482851737,7836416409,20897110425,
 47018498457]

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Last modified October 1 00:54 EDT 2020. Contains 337440 sequences. (Running on oeis4.)