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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.

A099578 a(n) = binomial(floor((3n+2)/2), floor(n/2)).

Table of values

n a(n)
0 1
1 1
2 4
3 5
4 21
5 28
6 120
7 165
8 715
9 1001
10 4368
11 6188
12 27132
13 38760
14 170544
15 245157
16 1081575
17 1562275
18 6906900
19 10015005
20 44352165
21 64512240
22 286097760
23 417225900
24 1852482996
25 2707475148
26 12033222880
27 17620076360
28 78378960360
29 114955808528

List of values

[1, 1, 4, 5, 21, 28, 120, 165, 715, 1001, 4368, 6188, 27132, 38760, 170544, 245157, 1081575, 1562275, 6906900, 10015005, 44352165, 64512240, 286097760, 417225900, 1852482996, 2707475148, 12033222880, 17620076360, 78378960360, 114955808528]

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

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