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A279285 as a simple table

n a(n)
0 0
1 1
2 4
3 18
4 82
5 377
6 1740
7 8045
8 37226
9 172314
10 797744
11 3693493
12 17101128
13 79180525
14 366618808
15 1697509962
16 7859781454
17 36392245541
18 168502887396
19 780199897985
20 3612471696230
21 16726421117538
22 77446465948772
23 358591660029577
24 1660346632032144
25 7687716275234809
26 35595568065121900
27 164814155562334914

[0,1,4,18,82,377,1740,8045,37226,172314,797744,
 3693493,17101128,79180525,366618808,1697509962,
 7859781454,36392245541,168502887396,780199897985,
 3612471696230,16726421117538,77446465948772,
 358591660029577,1660346632032144,7687716275234809,
 35595568065121900,164814155562334914]

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Last modified June 3 07:14 EDT 2020. Contains 334799 sequences. (Running on oeis4.)