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A293905 as a simple table

n a(n)
0 1
1 1
2 2
3 8
4 44
5 316
6 2656
7 26632
8 299408
9 3809744
10 53425376
11 823627456
12 13758271552
13 248997717568
14 4826005005824
15 100042516509056
16 2204677070418176
17 51515128563296512
18 1270613780164684288
19 33020423388135645184
20 900956861702008749056

[1,1,2,8,44,316,2656,26632,299408,3809744,
 53425376,823627456,13758271552,248997717568,
 4826005005824,100042516509056,2204677070418176,
 51515128563296512,1270613780164684288,
 33020423388135645184,900956861702008749056]

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Last modified May 25 04:50 EDT 2019. Contains 323539 sequences. (Running on oeis4.)