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A033886 as a simple table

n a(n)
0 1
1 0
2 0
3 0
4 0
5 0
6 0
7 0
8 1
9 0
10 2
11 2
12 12
13 31
14 220
15 1606
16 16828
17 193900
18 2452818
19 32670330
20 456028474
21 6636066099
22 100135577747
23 1582718912968 

[1,0,0,0,0,0,0,0,1,0,2,2,12,31,220,1606,16828,
 193900,2452818,32670330,456028474,6636066099,
 100135577747,1582718912968]

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Last modified April 19 23:40 EDT 2024. Contains 371798 sequences. (Running on oeis4.)