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A289354 as a simple table

n a(n)
1 1
2 9
3 45
4 165
5 495
6 1287
7 3003
8 6435
9 12870
10 24309
11 43741
12 75465
13 125445
14 201675
15 314523
16 477015
17 705012
18 1017225
19 1435005
20 1981845
21 2682559
22 3562131
23 4644255
24 5949615
25 7493982
26 9286233
27 11326425
28 13604085
29 16096905
30 18770031
31 21576079
32 24455955
33 27340500
34 30152925
35 32811945
36 35235465
37 37344615
38 39067875
39 40344975
40 41130255
41 41395240
42 41130255
43 40344975
44 39067875
45 37344615
46 35235465
47 32811945
48 30152925
49 27340500
50 24455955
51 21576079
52 18770031
53 16096905
54 13604085
55 11326425
56 9286233
57 7493982
58 5949615
59 4644255
60 3562131
61 2682559
62 1981845
63 1435005
64 1017225
65 705012
66 477015
67 314523
68 201675
69 125445
70 75465
71 43741
72 24309
73 12870
74 6432
75 3003
76 1287
77 495
78 165
79 45
80 9
81 1

[1,9,45,165,495,1287,3003,6435,12870,24309,43741,
 75465,125445,201675,314523,477015,705012,1017225,
 1435005,1981845,2682559,3562131,4644255,5949615,
 7493982,9286233,11326425,13604085,16096905,
 18770031,21576079,24455955,27340500,30152925,
 32811945,35235465,37344615,39067875,40344975,
 41130255,41395240,41130255,40344975,39067875,
 37344615,35235465,32811945,30152925,27340500,
 24455955,21576079,18770031,16096905,13604085,
 11326425,9286233,7493982,5949615,4644255,3562131,
 2682559,1981845,1435005,1017225,705012,477015,
 314523,201675,125445,75465,43741,24309,12870,6432,
 3003,1287,495,165,45,9,1]

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Last modified March 30 03:01 EDT 2024. Contains 371289 sequences. (Running on oeis4.)