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A189886 as a simple table

n a(n)
0 1
1 1
2 3
3 13
4 74
5 530
6 4550
7 45570
8 521640
9 6717480
10 96117000
11 1512819000
12 25975395600
13 483169486800
14 9678799930800
15 207733600074000
16 4755768505488000
17 115681418156304000
18 2979408725813520000
19 80998627977002736000
20 2317937034142810080000
21 69649003197501567840000
22 2192459412316607834400000
23 72152830779716793506400000
24 2477756318984329979756160000

[1,1,3,13,74,530,4550,45570,521640,6717480,
 96117000,1512819000,25975395600,483169486800,
 9678799930800,207733600074000,4755768505488000,
 115681418156304000,2979408725813520000,
 80998627977002736000,2317937034142810080000,
 69649003197501567840000,2192459412316607834400000,
 72152830779716793506400000,
 2477756318984329979756160000]

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Last modified April 19 19:02 EDT 2024. Contains 371798 sequences. (Running on oeis4.)