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A089093 as a simple table

n a(n)
1 0
2 1
3 4
4 16
5 51
6 154
7 418
8 1098
9 2726
10 6570
11 15308
12 34839
13 77412
14 168882
15 361896
16 764097
17 1590938
18 3272640
19 6656426
20 13403600
21 26739028
22 52892435
23 103806344
24 202263470
25 391460137
26 752923563
27 1439737364
28 2738144031
29 5181025837

[0,1,4,16,51,154,418,1098,2726,6570,15308,34839,
 77412,168882,361896,764097,1590938,3272640,
 6656426,13403600,26739028,52892435,103806344,
 202263470,391460137,752923563,1439737364,
 2738144031,5181025837]

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Last modified April 18 11:52 EDT 2024. Contains 371779 sequences. (Running on oeis4.)