cp's OEIS Frontend

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.

A087457 Number of odd length roads between any adjacent nodes in virtual optimal chordal ring of degree 3 (the length of chord < number of nodes/2).

Table of values

n a(n)
1 1
2 5
3 31
4 213
5 1551
6 11723
7 90945
8 719253
9 5773279
10 46889355
11 384487665
12 3177879675
13 26442188865
14 221278343445
15 1860908156031
16 15717475208853
17 133256583398655
18 1133591857814363
19 9672323357640129
20 82752014457666363
21 709719620585186529
22 6100394753270329605

List of values

[1, 5, 31, 213, 1551, 11723, 90945, 719253, 5773279, 46889355, 384487665, 3177879675, 26442188865, 221278343445, 1860908156031, 15717475208853, 133256583398655, 1133591857814363, 9672323357640129, 82752014457666363, 709719620585186529, 6100394753270329605]

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

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