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.

A265242 Number of 3Xn arrays containing n copies of 0..3-1 with no equal antidiagonal neighbors and new values introduced sequentially from 0.

Table of values

n a(n)
1 1
2 10
3 92
4 888
5 8880
6 91180
7 955320
8 10168092
9 109595168
10 1193414004
11 13106207640
12 144965453160
13 1613228920704
14 18047090084256
15 202816635014976
16 2288462757997500
17 25913609592575040
18 294366270662992612

List of values

[1, 10, 92, 888, 8880, 91180, 955320, 10168092, 109595168, 1193414004, 13106207640, 144965453160, 1613228920704, 18047090084256, 202816635014976, 2288462757997500, 25913609592575040, 294366270662992612]

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

Content is available under The OEIS End-User License Agreement.