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.

A229695 Number of defective 3-colorings of a 2Xn 0..2 array connected horizontally and antidiagonally with exactly two mistakes, and colors introduced in row-major 0..2 order.

Table of values

n a(n)
1 0
2 3
3 43
4 245
5 1171
6 5077
7 20691
8 80757
9 305235
10 1125333
11 4067091
12 14461173
13 50723091
14 175867605
15 603736659
16 2054728053
17 6940088019
18 23284024533
19 77651501715
20 257577229557
21 850273182099
22 2794463987157
23 9147385165779

List of values

[0, 3, 43, 245, 1171, 5077, 20691, 80757, 305235, 1125333, 4067091, 14461173, 50723091, 175867605, 603736659, 2054728053, 6940088019, 23284024533, 77651501715, 257577229557, 850273182099, 2794463987157, 9147385165779]

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

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