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This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.

A100561 Denominator of Sum_{k=0..[n/2]} 1/binomial(n,k).

Table of values

n a(n)
0 1
1 1
2 2
3 3
4 12
5 10
6 60
7 105
8 140
9 63
10 280
11 1155
12 27720
13 25740
14 8008
15 9009
16 16380
17 17017
18 6126120
19 2909907
20 5542680
21 2645370
22 232792560
23 111546435
24 535422888
25 128707425
26 2974571600
27 717084225
28 80313433200
29 77636318760
30 2329089562800
31 4512611027925
32 546983154900

List of values

[1, 1, 2, 3, 12, 10, 60, 105, 140, 63, 280, 1155, 27720, 25740, 8008, 9009, 16380, 17017, 6126120, 2909907, 5542680, 2645370, 232792560, 111546435, 535422888, 128707425, 2974571600, 717084225, 80313433200, 77636318760, 2329089562800, 4512611027925, 546983154900]

Started in 1964 by Neil J. A. Sloane | Maintained by The OEIS Foundation Inc.

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