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A051945 as a simple table

n a(n)
0 1
1 6
2 22
3 80
4 294
5 1092
6 4092
7 15444
8 58630
9 223652
10 856596
11 3292016
12 12688732
13 49031400
14 189885240
15 736808220
16 2863971270
17 11149451940
18 43465121700
19 169657266240
20 662976162420

[1,6,22,80,294,1092,4092,15444,58630,223652,
 856596,3292016,12688732,49031400,189885240,
 736808220,2863971270,11149451940,43465121700,
 169657266240,662976162420]

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Last modified August 18 08:57 EDT 2019. Contains 326077 sequences. (Running on oeis4.)