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A090581 as a simple table

n a(n)
1 1
2 6
3 21
4 56
5 126
6 252
7 462
8 792
9 1287
10 2001
11 2992
12 4317
13 6027
14 8162
15 10746
16 13782
17 17247
18 21087
19 25212
20 29496
21 33787
22 37917
23 41712
24 45002
25 47631
26 49467
27 50412
28 50412
29 49467
30 47631
31 45002
32 41712
33 37917
34 33787
35 29496
36 25212
37 21087
38 17247
39 13782
40 10746
41 8162
42 6027
43 4317
44 2992
45 2001
46 1287
47 792
48 462
49 252
50 126
51 56
52 21
53 6
54 1

[1,6,21,56,126,252,462,792,1287,2001,2992,4317,
 6027,8162,10746,13782,17247,21087,25212,29496,
 33787,37917,41712,45002,47631,49467,50412,50412,
 49467,47631,45002,41712,37917,33787,29496,25212,
 21087,17247,13782,10746,8162,6027,4317,2992,2001,
 1287,792,462,252,126,56,21,6,1]

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Last modified June 15 15:16 EDT 2021. Contains 345049 sequences. (Running on oeis4.)