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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.

A119358 Number of n-element subsets of [2n] having an even sum.

Table of values

n a(n)
0 1
1 1
2 2
3 10
4 38
5 126
6 452
7 1716
8 6470
9 24310
10 92252
11 352716
12 1352540
13 5200300
14 20056584
15 77558760
16 300546630
17 1166803110
18 4537543340
19 17672631900
20 68923356788
21 269128937220
22 1052049129144
23 4116715363800
24 16123803193628
25 63205303218876
26 247959261273752

List of values

[1, 1, 2, 10, 38, 126, 452, 1716, 6470, 24310, 92252, 352716, 1352540, 5200300, 20056584, 77558760, 300546630, 1166803110, 4537543340, 17672631900, 68923356788, 269128937220, 1052049129144, 4116715363800, 16123803193628, 63205303218876, 247959261273752]

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

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