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A002863 as a simple table

n a(n)
1 0
2 0
3 1
4 1
5 2
6 3
7 7
8 21
9 49
10 165
11 552
12 2176
13 9988
14 46972
15 253293
16 1388705
17 8053393
18 48266466
19 294130458 

[0,0,1,1,2,3,7,21,49,165,552,2176,9988,46972,
 253293,1388705,8053393,48266466,294130458]

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Last modified April 19 19:02 EDT 2024. Contains 371798 sequences. (Running on oeis4.)