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A279322 as a simple table

n a(n)
1 0
2 0
3 2
4 4
5 14
6 40
7 120
8 352
9 1032
10 3008
11 8736
12 25280
13 72928
14 209792
15 601984
16 1723392
17 4923520
18 14039040
19 39961088
20 113562624
21 322244096
22 913131520
23 2584180736
24 7304519680
25 20624050176
26 58170228736
27 163908034560
28 461421658112

[0,0,2,4,14,40,120,352,1032,3008,8736,25280,72928,
 209792,601984,1723392,4923520,14039040,39961088,
 113562624,322244096,913131520,2584180736,
 7304519680,20624050176,58170228736,163908034560,
 461421658112]

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Last modified January 22 20:00 EST 2022. Contains 350504 sequences. (Running on oeis4.)