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A215257 as a simple table

n a(n)
0 0
1 1
2 1
3 3
4 13
5 67
6 383
7 2345
8 15069
9 100341
10 686515
11 4797997
12 34110765
13 245926667
14 1793867881
15 13214905229
16 98177212059
17 734746226575
18 5534054981071
19 41917876423855
20 319102504087883
21 2440086947417629
22 18733909260242195
23 144354928765952131
24 1116015033661158079
25 8654019249571514621
26 67292250859412467583
27 524583875375437922949

[0,1,1,3,13,67,383,2345,15069,100341,686515,
 4797997,34110765,245926667,1793867881,13214905229,
 98177212059,734746226575,5534054981071,
 41917876423855,319102504087883,2440086947417629,
 18733909260242195,144354928765952131,
 1116015033661158079,8654019249571514621,
 67292250859412467583,524583875375437922949]

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Last modified February 26 05:36 EST 2020. Contains 332276 sequences. (Running on oeis4.)