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A158875 as a simple table

n a(n)
0 1
1 5
2 15
3 45
4 107
5 265
6 615
7 1485
8 3227
9 7225
10 15735
11 35325
12 75019
13 163145
14 348135
15 761805
16 1589147
17 3374905
18 7077495
19 15138045
20 31390219
21 66122825
22 137816295
23 292344525
24 601532059
25 1253593145
26 2591401335
27 5435447805
28 11157226763

[1,5,15,45,107,265,615,1485,3227,7225,15735,35325,
 75019,163145,348135,761805,1589147,3374905,
 7077495,15138045,31390219,66122825,137816295,
 292344525,601532059,1253593145,2591401335,
 5435447805,11157226763]

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Last modified February 4 10:00 EST 2023. Contains 360046 sequences. (Running on oeis4.)