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.

A277768 Number of 3Xn 0..2 arrays with every element equal to some element at offset (-1,-1) (-1,0) (-1,1) (0,-1) (0,1) or (1,0) both plus 1 mod 3 and minus 1 mod 3, with new values introduced in order 0..2.

Table of values

n a(n)
1 0
2 2
3 17
4 204
5 1989
6 21141
7 220549
8 2292380
9 23911889
10 249253583
11 2597767946
12 27078215723
13 282249897665
14 2942003150449
15 30665850885332
16 319644266438138
17 3331797339053418
18 34728844714392948
19 361994612635214032

List of values

[0, 2, 17, 204, 1989, 21141, 220549, 2292380, 23911889, 249253583, 2597767946, 27078215723, 282249897665, 2942003150449, 30665850885332, 319644266438138, 3331797339053418, 34728844714392948, 361994612635214032]