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A109721 as a simple table

n a(n)
0 1
1 3
2 21
3 77
4 252
5 567
6 1051
7 1465
8 1674
9 1465
10 1051
11 567
12 252
13 77
14 21
15 3
16 1 

[1,3,21,77,252,567,1051,1465,1674,1465,1051,567,
 252,77,21,3,1]

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Last modified April 24 04:14 EDT 2024. Contains 371918 sequences. (Running on oeis4.)