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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.

A187013 Number of isomorphism classes of simply embedded (i.e., loop-free and without parallel edges bounding a disk) quadrangulations of RP^2 of minimum degree 3 with n nodes and n-1 faces.

Table of values

n a(n)
4 1
5 0
6 2
7 3
8 6
9 12
10 37
11 95
12 293
13 923
14 3086
15 10504
16 36954
17 131590
18 475793

List of values

[1, 0, 2, 3, 6, 12, 37, 95, 293, 923, 3086, 10504, 36954, 131590, 475793]

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

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