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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.

A099582 a(n) = Sum_{k=0..floor(n/2)} binomial(n-k, k-1)*4^(n-k-1).

Table of values

n a(n)
0 0
1 0
2 1
3 4
4 24
5 112
6 560
7 2688
8 13056
9 62976
10 304384
11 1469440
12 7096320
13 34263040
14 165441536
15 798818304
16 3857055744
17 18623496192
18 89922273280
19 434183077888
20 2096421666816
21 10122418978816
22 48875363631104
23 235991130439680

List of values

[0, 0, 1, 4, 24, 112, 560, 2688, 13056, 62976, 304384, 1469440, 7096320, 34263040, 165441536, 798818304, 3857055744, 18623496192, 89922273280, 434183077888, 2096421666816, 10122418978816, 48875363631104, 235991130439680]

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

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