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.

A220624 Number of ways to reciprocally link elements of an 5Xn array either to themselves or to exactly one horizontal, diagonal and antidiagonal neighbor.

Table of values

n a(n)
1 1
2 228
3 4657
4 243119
5 8608738
6 356768525
7 13864972277
8 553125347136
9 21831846871613
10 865461975018339
11 34247958158855874
12 1356237159188241529
13 53691862459540232153
14 2125854494007156918632
15 84166119627538600335289

List of values

[1, 228, 4657, 243119, 8608738, 356768525, 13864972277, 553125347136, 21831846871613, 865461975018339, 34247958158855874, 1356237159188241529, 53691862459540232153, 2125854494007156918632, 84166119627538600335289]

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

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