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A077994 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

[1,1,4,12,34,100,292,852,2488,7264,21208,61920,
 180784,527824,1541056,4499328]

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Last modified August 14 03:05 EDT 2020. Contains 336477 sequences. (Running on oeis4.)