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A001883 as a simple table

n a(n)
0 1
1 0
2 0
3 0
4 1
5 4
6 29
7 206
8 1708
9 15702
10 159737
11 1780696
12 21599745
13 283294740
14 3995630216
15 60312696452
16 970234088153
17 16571597074140
18 299518677455165
19 5711583170669554
20 114601867572247060
21 2413623459384988298
22 53238503492701261201
23 1227382998752177970288
24 29520591675204638641249

[1,0,0,0,1,4,29,206,1708,15702,159737,1780696,
 21599745,283294740,3995630216,60312696452,
 970234088153,16571597074140,299518677455165,
 5711583170669554,114601867572247060,
 2413623459384988298,53238503492701261201,
 1227382998752177970288,29520591675204638641249]

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Last modified May 19 23:42 EDT 2024. Contains 372703 sequences. (Running on oeis4.)