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A060898 as a simple table

n a(n)
0 1
1 4
2 14
3 54
4 200
5 776
6 2940
7 11466
8 43980
9 172170
10 665544
11 2612764
12 10154144
13 39949000
14 155864280
15 614260062
16 2403739140
17 9486263092
18 37209147800
19 147012850512
20 577741491404
21 2284848892872
22 8993216244896
23 35595538140656
24 140288753584200
25 555662416386840

[1,4,14,54,200,776,2940,11466,43980,172170,665544,
 2612764,10154144,39949000,155864280,614260062,
 2403739140,9486263092,37209147800,147012850512,
 577741491404,2284848892872,8993216244896,
 35595538140656,140288753584200,555662416386840]

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Last modified January 25 16:42 EST 2020. Contains 331245 sequences. (Running on oeis4.)