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A020088 as a simple table

n a(n)
0 1
1 0
2 1
3 2
4 10
5 50
6 287
7 1915
8 14684
9 127262
10 1230201
11 13122149
12 153091744
13 1939162100
14 26501882045
15 388694270000
16 6089543563340
17 101492392722342
18 1793032271428052
19 33469935733323641
20 658242069422031618

[1,0,1,2,10,50,287,1915,14684,127262,1230201,
 13122149,153091744,1939162100,26501882045,
 388694270000,6089543563340,101492392722342,
 1793032271428052,33469935733323641,
 658242069422031618]

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Last modified May 27 13:23 EDT 2024. Contains 372861 sequences. (Running on oeis4.)