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A223093 as a simple table

n a(n)
1 0
2 0
3 2
4 4
5 16
6 38
7 132
8 342
9 1144
10 3134
11 10370
12 29526
13 97458
14 285458
15 942920
16 2822310
17 9341008
18 28440970
19 94358558
20 291294678
21 968853072
22 3025232480
23 10086634316
24 31797822936
25 106265437078
26 337731551446
27 1131117792978
28 3620119437762
29 12148796744234
30 39118879440938

[0,0,2,4,16,38,132,342,1144,3134,10370,29526,
 97458,285458,942920,2822310,9341008,28440970,
 94358558,291294678,968853072,3025232480,
 10086634316,31797822936,106265437078,337731551446,
 1131117792978,3620119437762,12148796744234,
 39118879440938]

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Last modified September 15 07:14 EDT 2024. Contains 375932 sequences. (Running on oeis4.)