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.

A219405 Unmatched value maps: number of n X 3 binary arrays indicating the locations of corresponding elements not equal to any horizontal or antidiagonal neighbor in a random 0..2 n X 3 array.

Table of values

n a(n)
1 4
2 28
3 181
4 1180
5 7687
6 50077
7 326233
8 2125270
9 13845268
10 90196219
11 587591326
12 3827916001
13 24937299865
14 162456261409
15 1058335787620
16 6894622770400
17 44915634248581
18 292606900638904
19 1906213721217931
20 12418199102692513

List of values

[4, 28, 181, 1180, 7687, 50077, 326233, 2125270, 13845268, 90196219, 587591326, 3827916001, 24937299865, 162456261409, 1058335787620, 6894622770400, 44915634248581, 292606900638904, 1906213721217931, 12418199102692513]