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.

A229640 Number of defective 3-colorings of a 4 X n 0..2 array connected horizontally, diagonally and antidiagonally with exactly two mistakes, and colors introduced in row-major 0..2 order.

Table of values

n a(n)
1 0
2 202
3 1496
4 10227
5 77620
6 535671
7 3723370
8 25022190
9 166505166
10 1090285513
11 7066637900
12 45333775056
13 288422981684
14 1821192582307
15 11424271291526
16 71241698297248
17 441922120307156
18 2728236364222397
19 16770150954151850

List of values

[0, 202, 1496, 10227, 77620, 535671, 3723370, 25022190, 166505166, 1090285513, 7066637900, 45333775056, 288422981684, 1821192582307, 11424271291526, 71241698297248, 441922120307156, 2728236364222397, 16770150954151850]