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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.

A028341 Coefficient of x^4 in expansion of (x+1)*(x+3)*...*(x+2*n-1).

Table of values

n a(n)
4 1
5 25
6 505
7 10045
8 208054
9 4574934
10 107494190
11 2702025590
12 72578259391
13 2078757113719
14 63324503917311
15 2046225352864875
16 69953125893139644
17 2523698606200763196
18 95853765344939263692
19 3824294822931302783964
20 159940198124792648875341
21 6998152417792503243516261

List of values

[1, 25, 505, 10045, 208054, 4574934, 107494190, 2702025590, 72578259391, 2078757113719, 63324503917311, 2046225352864875, 69953125893139644, 2523698606200763196, 95853765344939263692, 3824294822931302783964, 159940198124792648875341, 6998152417792503243516261]

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

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