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A000661 as a simple table

n a(n)
0 1
1 0
2 1
3 1
4 2
5 6
6 17
7 62
8 259
9 1230
10 6592
11 39313
12 258575
13 1860318
14 14538245
15 122670593
16 1111715644
17 10771412394
18 111125142979
19 1216309735378
20 14078811306851
21 171837279141312
22 2205768169095338
23 29707098687614285

[1,0,1,1,2,6,17,62,259,1230,6592,39313,258575,
 1860318,14538245,122670593,1111715644,10771412394,
 111125142979,1216309735378,14078811306851,
 171837279141312,2205768169095338,
 29707098687614285]

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Last modified July 16 01:40 EDT 2024. Contains 374343 sequences. (Running on oeis4.)