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A000116 as a simple table

n a(n)
0 1
1 2
2 4
3 8
4 20
5 56
6 180
7 596
8 2068
9 7316
10 26272
11 95420
12 349716
13 1290872
14 4794088
15 17896832
16 67110932
17 252648992
18 954444608
19 3616828364
20 13743921632
21 52357746896
22 199911300472
23 764877836468
24 2932031358484
25 11258999739560
26 43303843861744
27 166799988689300

[1,2,4,8,20,56,180,596,2068,7316,26272,95420,
 349716,1290872,4794088,17896832,67110932,
 252648992,954444608,3616828364,13743921632,
 52357746896,199911300472,764877836468,
 2932031358484,11258999739560,43303843861744,
 166799988689300]

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Last modified May 4 20:57 EDT 2024. Contains 372257 sequences. (Running on oeis4.)