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A278613 as a simple table

n a(n)
0 3
1 8
2 21
3 55
4 145
5 381
6 1001
7 2633
8 6921
9 18193
10 47833
11 125745
12 330569
13 869057
14 2284665
15 6006193
16 15789865
17 41510241
18 109127129
19 286886801

[3,8,21,55,145,381,1001,2633,6921,18193,47833,
 125745,330569,869057,2284665,6006193,15789865,
 41510241,109127129,286886801]

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Last modified August 10 12:36 EDT 2022. Contains 356039 sequences. (Running on oeis4.)