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.

A275560 Number of n X 3 0..2 arrays with no element equal to any value at offset (-2,0) (-1,2) or (0,-2) and new values introduced in order 0..2.

Table of values

n a(n)
1 3
2 36
3 126
4 504
5 1872
6 7200
7 27360
8 104256
9 397440
10 1513728
11 5769216
12 21980160
13 83755008
14 319131648
15 1215995904
16 4633362432
17 17654611968
18 67270017024
19 256320995328
20 976668327936
21 3721430827008
22 14179888005120
23 54030086701056

List of values

[3, 36, 126, 504, 1872, 7200, 27360, 104256, 397440, 1513728, 5769216, 21980160, 83755008, 319131648, 1215995904, 4633362432, 17654611968, 67270017024, 256320995328, 976668327936, 3721430827008, 14179888005120, 54030086701056]