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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.

A001405 a(n) = binomial(n, floor(n/2)).

Table of values

n a(n)
0 1
1 1
2 2
3 3
4 6
5 10
6 20
7 35
8 70
9 126
10 252
11 462
12 924
13 1716
14 3432
15 6435
16 12870
17 24310
18 48620
19 92378
20 184756
21 352716
22 705432
23 1352078
24 2704156
25 5200300
26 10400600
27 20058300
28 40116600
29 77558760
30 155117520
31 300540195
32 601080390
33 1166803110

List of values

[1, 1, 2, 3, 6, 10, 20, 35, 70, 126, 252, 462, 924, 1716, 3432, 6435, 12870, 24310, 48620, 92378, 184756, 352716, 705432, 1352078, 2704156, 5200300, 10400600, 20058300, 40116600, 77558760, 155117520, 300540195, 601080390, 1166803110]

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

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