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A018172 as a simple table

n a(n)
0 1
1 2
2 3
3 6
4 11
5 20
6 36
7 66
8 121
9 220
10 400
11 728
12 1326
13 2414
14 4394
15 8000
16 14565
17 26516
18 48273
19 87885
20 160000
21 291290
22 530313
23 965468
24 1757697
25 3200000
26 5825805
27 10606253
28 19309364
29 35153937
30 64000000
31 116516109

[1,2,3,6,11,20,36,66,121,220,400,728,1326,2414,
 4394,8000,14565,26516,48273,87885,160000,291290,
 530313,965468,1757697,3200000,5825805,10606253,
 19309364,35153937,64000000,116516109]

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Last modified April 19 21:09 EDT 2024. Contains 371798 sequences. (Running on oeis4.)