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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.

A220560 Number of ways to reciprocally link elements of an nX6 array either to themselves or to exactly one horizontal or antidiagonal neighbor.

Table of values

n a(n)
1 13
2 481
3 16310
4 561636
5 19333688
6 665748170
7 22926570957
8 789539775889
9 27190037181789
10 936366170726784
11 32246430390993213
12 1110497486239608510
13 38243137393453789704
14 1317011137774021018880
15 45355021979509463823738

List of values

[13, 481, 16310, 561636, 19333688, 665748170, 22926570957, 789539775889, 27190037181789, 936366170726784, 32246430390993213, 1110497486239608510, 38243137393453789704, 1317011137774021018880, 45355021979509463823738]

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

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