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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.

A254686 Number of ways to put n red and n blue balls into n indistinguishable boxes.

Table of values

n a(n)
0 1
1 1
2 5
3 19
4 74
5 248
6 814
7 2457
8 7168
9 19928
10 53688
11 139820
12 354987
13 878434
14 2128102
15 5052010
16 11781881
17 27019758
18 61035671
19 135928105
20 298784144
21 648726349
22 1392474574
23 2956730910
24 6214668074
25 12937060340
26 26686392239
27 54572423946
28 110680119454
29 222710856175
30 444776676764

List of values

[1, 1, 5, 19, 74, 248, 814, 2457, 7168, 19928, 53688, 139820, 354987, 878434, 2128102, 5052010, 11781881, 27019758, 61035671, 135928105, 298784144, 648726349, 1392474574, 2956730910, 6214668074, 12937060340, 26686392239, 54572423946, 110680119454, 222710856175, 444776676764]

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

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