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A309298 as a simple table

n a(n)
0 0
1 0
2 0
3 1
4 2
5 7
6 20
7 49
8 132
9 330
10 786
11 1892
12 4472
13 10368
14 23940
15 54720
16 123836
17 278664
18 622896
19 1383672
20 3058720
21 6729184
22 14738688
23 32157312
24 69907200
25 151461952
26 327158208
27 704648448
28 1513680192
29 3243601280
30 6934595840
31 14793782400
32 31496441856
33 66929938944

[0,0,0,1,2,7,20,49,132,330,786,1892,4472,10368,
 23940,54720,123836,278664,622896,1383672,3058720,
 6729184,14738688,32157312,69907200,151461952,
 327158208,704648448,1513680192,3243601280,
 6934595840,14793782400,31496441856,66929938944]

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Last modified April 25 05:56 EDT 2024. Contains 371964 sequences. (Running on oeis4.)