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A231091 as a simple table

n a(n)
1 0
2 0
3 0
4 0
5 1
6 1
7 5
8 27
9 175
10 1533
11 14361
12 151575
13 1735869
14 21594863
15 289365383
16 4158887007
17 63822480809
18 1041820050629
19 18027531255745
20 329658402237171
21 6352776451924233
22 128686951765990343
23 2733851297673484765
24 60781108703102022027
25 1411481990523638719737

[0,0,0,0,1,1,5,27,175,1533,14361,151575,1735869,
 21594863,289365383,4158887007,63822480809,
 1041820050629,18027531255745,329658402237171,
 6352776451924233,128686951765990343,
 2733851297673484765,60781108703102022027,
 1411481990523638719737]

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Last modified April 24 18:17 EDT 2024. Contains 371962 sequences. (Running on oeis4.)