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A182881 as a simple table

n a(n)
0 0
1 0
2 0
3 2
4 6
5 18
6 56
7 162
8 462
9 1306
10 3648
11 10116
12 27892
13 76524
14 209112
15 569506
16 1546542
17 4189314
18 11323480
19 30548190
20 82272330
21 221240070
22 594131160
23 1593553452
24 4269391596
25 11426761548
26 30554523096
27 81631135502
28 217918012002

[0,0,0,2,6,18,56,162,462,1306,3648,10116,27892,
 76524,209112,569506,1546542,4189314,11323480,
 30548190,82272330,221240070,594131160,1593553452,
 4269391596,11426761548,30554523096,81631135502,
 217918012002]

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Last modified May 15 08:59 EDT 2021. Contains 343909 sequences. (Running on oeis4.)