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A115390 as a simple table

n a(n)
0 0
1 0
2 1
3 4
4 12
5 34
6 96
7 272
8 772
9 2192
10 6224
11 17672
12 50176
13 142464
14 404496
15 1148480
16 3260864
17 9258528
18 26287616
19 74638080
20 211918912
21 601698560
22 1708394752
23 4850622592
24 13772308480
25 39103533056
26 111026143488
27 315235058688

[0,0,1,4,12,34,96,272,772,2192,6224,17672,50176,
 142464,404496,1148480,3260864,9258528,26287616,
 74638080,211918912,601698560,1708394752,
 4850622592,13772308480,39103533056,111026143488,
 315235058688]

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Last modified April 24 18:05 EDT 2024. Contains 371962 sequences. (Running on oeis4.)