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.

A268143 Number of 3 X n arrays containing n copies of 0..3-1 with every element equal to at least one diagonal or antidiagonal neighbor and the top left element equal to 0.

Table of values

n a(n)
1 0
2 0
3 0
4 8
5 32
6 238
7 1488
8 9778
9 91628
10 685364
11 5183732
12 43292440
13 341958992
14 2698310688
15 22015262376
16 177423576662
17 1428012268840
18 11630157575168
19 94604167006872
20 769682941957332
21 6291338814803772
22 51481101154395306

List of values

[0, 0, 0, 8, 32, 238, 1488, 9778, 91628, 685364, 5183732, 43292440, 341958992, 2698310688, 22015262376, 177423576662, 1428012268840, 11630157575168, 94604167006872, 769682941957332, 6291338814803772, 51481101154395306]

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

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