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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.

A213803 Number of 5 X 5 0..n symmetric arrays with all rows summing to floor(n*5/2).

Table of values

n a(n)
1 112
2 5673
3 87932
4 815263
5 4843626
6 22698959
7 84662388
8 275879169
9 782758404
10 2036181209
11 4827542558
12 10773876919
13 22498928491
14 44939366943
15 85390966217
16 156814686053
17 276999175867
18 476278194021
19 793826178700
20 1294496520831

List of values

[112, 5673, 87932, 815263, 4843626, 22698959, 84662388, 275879169, 782758404, 2036181209, 4827542558, 10773876919, 22498928491, 44939366943, 85390966217, 156814686053, 276999175867, 476278194021, 793826178700, 1294496520831]

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

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