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A137747 as a simple table

n a(n)
0 0
1 0
2 0
3 0
4 0
5 0
6 0
7 1
8 7
9 34
10 143
11 555
12 2050
13 7343
14 25809
15 89642
16 308986
17 1059786
18 3623524
19 12365973
20 42160774
21 143701920

[0,0,0,0,0,0,0,1,7,34,143,555,2050,7343,25809,
 89642,308986,1059786,3623524,12365973,42160774,
 143701920]

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Last modified March 28 09:04 EDT 2024. Contains 371240 sequences. (Running on oeis4.)