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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.

A271943 The sum of the widths of all bargraphs of semiperimeter n (n>=2).

Table of values

n a(n)
2 1
3 3
4 10
5 33
6 108
7 353
8 1154
9 3776
10 12371
11 40586
12 133337
13 438641
14 1444848
15 4764919
16 15731660
17 51993074
18 172003177
19 569531599
20 1887392588
21 6259572697
22 20775058670
23 68997611310
24 229298384183
25 762475061094
26 2536834093693
27 8444728118220
28 28125035969635
29 93713472090623
30 312392935140250
31 1041790050460247
32 3475597146726072

List of values

[1, 3, 10, 33, 108, 353, 1154, 3776, 12371, 40586, 133337, 438641, 1444848, 4764919, 15731660, 51993074, 172003177, 569531599, 1887392588, 6259572697, 20775058670, 68997611310, 229298384183, 762475061094, 2536834093693, 8444728118220, 28125035969635, 93713472090623, 312392935140250, 1041790050460247, 3475597146726072]

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

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