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A077843 as a simple table

n a(n)
0 1
1 1
2 4
3 12
4 34
5 100
6 292
7 852
8 2488
9 7264
10 21208
11 61920
12 180784
13 527824
14 1541056
15 4499328
16 13136416
17 38353600
18 111978688
19 326937408
20 954539392
21 2786910976
22 8136775552
23 23756451840
24 69360276736
25 202507008256
26 591247473664
27 1726229517312
28 5039967998464

[1,1,4,12,34,100,292,852,2488,7264,21208,61920,
 180784,527824,1541056,4499328,13136416,38353600,
 111978688,326937408,954539392,2786910976,
 8136775552,23756451840,69360276736,202507008256,
 591247473664,1726229517312,5039967998464]

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Last modified March 26 10:18 EDT 2019. Contains 321491 sequences. (Running on oeis4.)