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A143556 as a simple table

n a(n)
0 1
1 1
2 6
3 18
4 110
5 498
6 3366
7 17282
8 122958
9 672930
10 4938758
11 28103730
12 210595182
13 1230391058
14 9358456230
15 55727128866
16 428643977422
17 2589488117826
18 20092671283974
19 122759098980690
20 959216278565742
21 5913900861617970

[1,1,6,18,110,498,3366,17282,122958,672930,
 4938758,28103730,210595182,1230391058,9358456230,
 55727128866,428643977422,2589488117826,
 20092671283974,122759098980690,959216278565742,
 5913900861617970]

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Last modified June 20 05:29 EDT 2024. Contains 373512 sequences. (Running on oeis4.)