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A206918 as a simple table

n a(n)
0 0
1 1
2 4
3 16
4 40
5 136
6 328
7 1096
8 2632
9 8776
10 21064
11 70216
12 168520
13 561736
14 1348168
15 4493896
16 10785352
17 35951176
18 86282824
19 287609416
20 690262600
21 2300875336
22 5522100808
23 18407002696
24 44176806472
25 147256021576
26 353414451784
27 1178048172616
28 2827315614280

[0,1,4,16,40,136,328,1096,2632,8776,21064,70216,
 168520,561736,1348168,4493896,10785352,35951176,
 86282824,287609416,690262600,2300875336,
 5522100808,18407002696,44176806472,147256021576,
 353414451784,1178048172616,2827315614280]

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Last modified April 20 17:54 EDT 2019. Contains 322310 sequences. (Running on oeis4.)