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A089102 as a simple table

n a(n)
1 0
2 1
3 5
4 16
5 54
6 154
7 425
8 1098
9 2743
10 6570
11 15345
12 34839
13 77489
14 168882
15 362054
16 764097
17 1591252
18 3272640
19 6657037
20 13403600
21 26740202
22 52892435
23 103808566
24 202263470
25 391464293
26 752923563
27 1439745067
28 2738144031
29 5181039986

[0,1,5,16,54,154,425,1098,2743,6570,15345,34839,
 77489,168882,362054,764097,1591252,3272640,
 6657037,13403600,26740202,52892435,103808566,
 202263470,391464293,752923563,1439745067,
 2738144031,5181039986]

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Last modified March 8 08:48 EST 2021. Contains 341945 sequences. (Running on oeis4.)