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A018036 as a simple table

n a(n)
0 1
1 2
2 7
3 21
4 57
5 159
6 441
7 1216
8 3356
9 9261
10 25550
11 70491
12 194481
13 536558
14 1480323
15 4084101
16 11267724
17 31086798
18 85766121
19 236622224
20 652822776
21 1801088541
22 4969066719
23 13709278306
24 37822859361
25 104350401110
26 287894844440
27 794280046581
28 2191358423329

[1,2,7,21,57,159,441,1216,3356,9261,25550,70491,
 194481,536558,1480323,4084101,11267724,31086798,
 85766121,236622224,652822776,1801088541,
 4969066719,13709278306,37822859361,104350401110,
 287894844440,794280046581,2191358423329]

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Last modified March 28 20:05 EDT 2024. Contains 371254 sequences. (Running on oeis4.)