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.

A221831 Number of 4Xn arrays of occupancy after each element moves to some horizontal, vertical or antidiagonal neighbor, without 2-loops or left turns.

Table of values

n a(n)
1 0
2 64
3 2930
4 115417
5 4715043
6 192788993
7 7888216533
8 322723834959
9 13203608881221
10 540203150208573
11 22101534579211095
12 904249026745794715
13 36995912673327194833
14 1513629078095632460534
15 61927733346071816062294

List of values

[0, 64, 2930, 115417, 4715043, 192788993, 7888216533, 322723834959, 13203608881221, 540203150208573, 22101534579211095, 904249026745794715, 36995912673327194833, 1513629078095632460534, 61927733346071816062294]

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

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