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.

A220559 Number of ways to reciprocally link elements of an n X 5 array either to themselves or to exactly one horizontal or antidiagonal neighbor.

Table of values

n a(n)
1 8
2 149
3 2604
4 45966
5 810778
6 14298089
7 252139015
8 4446314533
9 78407942556
10 1382674335890
11 24382584703194
12 429971411669361
13 7582273047532603
14 133708574584054949
15 2357865880743076540
16 41579468847568886038

List of values

[8, 149, 2604, 45966, 810778, 14298089, 252139015, 4446314533, 78407942556, 1382674335890, 24382584703194, 429971411669361, 7582273047532603, 133708574584054949, 2357865880743076540, 41579468847568886038]