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A074506 as a simple table

n a(n)
0 3
1 8
2 26
3 92
4 338
5 1268
6 4826
7 18572
8 72098
9 281828
10 1107626
11 4371452
12 17308658
13 68703188
14 273218426
15 1088090732
16 4338014018
17 17309009348
18 69106897226
19 276040168412
20 1102998412178
21 4408506864308
22 17623567104026

[3,8,26,92,338,1268,4826,18572,72098,281828,
 1107626,4371452,17308658,68703188,273218426,
 1088090732,4338014018,17309009348,69106897226,
 276040168412,1102998412178,4408506864308,
 17623567104026]

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Last modified August 3 20:08 EDT 2020. Contains 336201 sequences. (Running on oeis4.)