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A051960 as a simple table

n a(n)
0 2
1 5
2 16
3 55
4 196
5 714
6 2640
7 9867
8 37180
9 140998
10 537472
11 2057510
12 7904456
13 30458900
14 117675360
15 455657715
16 1767883500
17 6871173870
18 26747767200
19 104268528210
20 406975466040
21 1590307356300
22 6220814327520
23 24357232569150
24 95452906901976
25 374369872911804

[2,5,16,55,196,714,2640,9867,37180,140998,537472,
 2057510,7904456,30458900,117675360,455657715,
 1767883500,6871173870,26747767200,104268528210,
 406975466040,1590307356300,6220814327520,
 24357232569150,95452906901976,374369872911804]

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Last modified April 19 05:19 EDT 2024. Contains 371782 sequences. (Running on oeis4.)