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.

A208138 Number of n X 4 0..1 arrays avoiding 0 0 1 and 0 1 1 horizontally and 0 0 1 and 1 0 1 vertically.

Table of values

n a(n)
1 9
2 81
3 324
4 900
5 2025
6 3969
7 7056
8 11664
9 18225
10 27225
11 39204
12 54756
13 74529
14 99225
15 129600
16 166464
17 210681
18 263169
19 324900
20 396900
21 480249
22 576081
23 685584
24 810000
25 950625
26 1108809
27 1285956
28 1483524
29 1703025
30 1946025
31 2214144
32 2509056
33 2832489

List of values

[9, 81, 324, 900, 2025, 3969, 7056, 11664, 18225, 27225, 39204, 54756, 74529, 99225, 129600, 166464, 210681, 263169, 324900, 396900, 480249, 576081, 685584, 810000, 950625, 1108809, 1285956, 1483524, 1703025, 1946025, 2214144, 2509056, 2832489]