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A219971 as a simple table

n a(n)
0 1
1 0
2 3
3 13
4 31
5 170
6 804
7 2744
8 12343
9 55657
10 214485
11 923990
12 4008013
13 16241904
14 68963484
15 293830787
16 1216393406
17 5135225641
18 21711233759
19 90692128053
20 381960417890
21 1609647053073
22 6749229887672
23 28396742081001
24 119506154362773
25 501879008939056

[1,0,3,13,31,170,804,2744,12343,55657,214485,
 923990,4008013,16241904,68963484,293830787,
 1216393406,5135225641,21711233759,90692128053,
 381960417890,1609647053073,6749229887672,
 28396742081001,119506154362773,501879008939056]

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Last modified May 18 16:58 EDT 2024. Contains 372664 sequences. (Running on oeis4.)