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A022633 as a simple table

n a(n)
0 1
1 5
2 20
3 75
4 240
5 726
6 2075
7 5620
8 14645
9 36875
10 90057
11 214065
12 497170
13 1129670
14 2517425
15 5512125
16 11871310
17 25184930
18 52686885
19 108786970
20 221894842
21 447455885
22 892609420
23 1762608545
24 3447282925
25 6680871925
26 12835968690
27 24459374345
28 46243132855
29 86773966825
30 161664667295

[1,5,20,75,240,726,2075,5620,14645,36875,90057,
 214065,497170,1129670,2517425,5512125,11871310,
 25184930,52686885,108786970,221894842,447455885,
 892609420,1762608545,3447282925,6680871925,
 12835968690,24459374345,46243132855,86773966825,
 161664667295]

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Last modified September 25 21:49 EDT 2022. Contains 356986 sequences. (Running on oeis4.)