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A189348 as a simple table

n a(n)
1 1
2 4
3 13
4 45
5 160
6 565
7 2005
8 7108
9 25209
10 89401
11 317056
12 1124425
13 3987721
14 14142276
15 50154949
16 177872293
17 630816160
18 2237161405
19 7933993245
20 28137553540
21 99788579953
22 353895752689
23 1255075518976
24 4451069407761
25 15785519335825

[1,4,13,45,160,565,2005,7108,25209,89401,317056,
 1124425,3987721,14142276,50154949,177872293,
 630816160,2237161405,7933993245,28137553540,
 99788579953,353895752689,1255075518976,
 4451069407761,15785519335825]

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Last modified April 16 07:59 EDT 2021. Contains 343030 sequences. (Running on oeis4.)