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A026163 as a simple table

n a(n)
1 1
2 2
3 6
4 16
5 45
6 126
7 356
8 1008
9 2862
10 8140
11 23188
12 66144
13 188916
14 540216
15 1546560
16 4432512
17 12717513
18 36526626
19 105016686
20 302228080
21 870613689
22 2510249302
23 7244285436
24 20924179920
25 60487084775
26 174994990326
27 506669921982

[1,2,6,16,45,126,356,1008,2862,8140,23188,66144,
 188916,540216,1546560,4432512,12717513,36526626,
 105016686,302228080,870613689,2510249302,
 7244285436,20924179920,60487084775,174994990326,
 506669921982]

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Last modified January 16 09:13 EST 2021. Contains 340204 sequences. (Running on oeis4.)