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.

A204623 Number of (n+1)X2 0..2 arrays with every 2X2 subblock having unequal diagonal elements or unequal antidiagonal elements, and new values 0..2 introduced in row major order.

Table of values

n a(n)
1 12
2 96
3 768
4 6144
5 49152
6 393216
7 3145728
8 25165824
9 201326592
10 1610612736
11 12884901888
12 103079215104
13 824633720832
14 6597069766656
15 52776558133248
16 422212465065984
17 3377699720527872
18 27021597764222976
19 216172782113783808

List of values

[12, 96, 768, 6144, 49152, 393216, 3145728, 25165824, 201326592, 1610612736, 12884901888, 103079215104, 824633720832, 6597069766656, 52776558133248, 422212465065984, 3377699720527872, 27021597764222976, 216172782113783808]

Started in 1964 by Neil J. A. Sloane | Maintained by The OEIS Foundation Inc.

Content is available under The OEIS End-User License Agreement.