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A195440 as a simple table

n a(n)
1 1
2 1
3 4
4 21
5 134
6 968
7 7662
8 65135
9 587040
10 5559342
11 54965230
12 564651110
13 6004908296
14 65920345700
15 745289233564
16 8661959227407
17 103330815828292
18 1263608418272768
19 15823268263301680
20 202712359166886406
21 2654710188935753950
22 35514167158635839770

[1,1,4,21,134,968,7662,65135,587040,5559342,
 54965230,564651110,6004908296,65920345700,
 745289233564,8661959227407,103330815828292,
 1263608418272768,15823268263301680,
 202712359166886406,2654710188935753950,
 35514167158635839770]

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Last modified May 15 04:25 EDT 2024. Contains 372536 sequences. (Running on oeis4.)