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.

A233162 Number of n X 1 0..7 arrays with no element x(i,j) adjacent to itself or value 7-x(i,j) horizontally, diagonally, antidiagonally or vertically, top left element zero, and 1 appearing before 2 3 4 5 and 6, 2 appearing before 3 4 and 5, and 3 appearing before 4 in row major order (unlabeled 8-colorings with no clashing color pairs).

Table of values

n a(n)
1 1
2 1
3 3
4 11
5 48
6 236
7 1248
8 6896
9 39168
10 226496
11 1325568
12 7821056
13 46399488
14 276294656
15 1649369088
16 9862639616
17 59041579008
18 353712521216
19 2120127479808
20 12712174616576
21 76238687305728
22 457294683570176
23 2743218342985728

List of values

[1, 1, 3, 11, 48, 236, 1248, 6896, 39168, 226496, 1325568, 7821056, 46399488, 276294656, 1649369088, 9862639616, 59041579008, 353712521216, 2120127479808, 12712174616576, 76238687305728, 457294683570176, 2743218342985728]

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

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