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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.

A318244 a(n) is the number of configurations of n indistinguishable pairs placed on the vertices of the ladder graph P_2 X P_n such that only one such pair is joined by an edge.

Table of values

n a(n)
1 1
2 0
3 8
4 34
5 347
6 3666
7 47484
8 707480
9 11971341
10 226599568
11 4744010444
12 108834109034
13 2714992695407
14 73169624071138
15 2118530753728184
16 65582753432993648
17 2161565971116312537
18 75572040870327124064
19 2793429487732659591888
20 108847840347732886117874
21 4459207771645802095292995

List of values

[1, 0, 8, 34, 347, 3666, 47484, 707480, 11971341, 226599568, 4744010444, 108834109034, 2714992695407, 73169624071138, 2118530753728184, 65582753432993648, 2161565971116312537, 75572040870327124064, 2793429487732659591888, 108847840347732886117874, 4459207771645802095292995]

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

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