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A231051 as a simple table

n a(n)
1 0
2 2
3 50
4 128
5 644
6 5100
7 33696
8 211032
9 1354848
10 8755256
11 56382600
12 362808600
13 2335743720
14 15038803080
15 96821412760
16 623339871560
17 4013124023592
18 25836921761608
19 166340644854200
20 1070917308473608
21 6894671429298216

[0,2,50,128,644,5100,33696,211032,1354848,8755256,
 56382600,362808600,2335743720,15038803080,
 96821412760,623339871560,4013124023592,
 25836921761608,166340644854200,1070917308473608,
 6894671429298216]

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Last modified December 5 19:33 EST 2023. Contains 367593 sequences. (Running on oeis4.)