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A181337 as a simple table

n a(n)
0 0
1 1
2 6
3 28
4 123
5 512
6 2064
7 8124
8 31416
9 119820
10 451972
11 1689532
12 6268276
13 23107836
14 84721796
15 309151932
16 1123431812
17 4067533244
18 14679173444
19 52821023932
20 189571527236
21 678748381372
22 2424976195396
23 8646702275772

[0,1,6,28,123,512,2064,8124,31416,119820,451972,
 1689532,6268276,23107836,84721796,309151932,
 1123431812,4067533244,14679173444,52821023932,
 189571527236,678748381372,2424976195396,
 8646702275772]

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Last modified October 22 22:34 EDT 2019. Contains 328335 sequences. (Running on oeis4.)