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.

A275568 Number of 5Xn 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 12
2 864
3 1872
4 4056
5 13104
6 42336
7 138600
8 453750
9 1506450
10 5001414
11 16784592
12 56328576
13 190035408
14 641121414
15 2165870262
16 7316857446
17 24718829850
18 83508603750
19 282120696000
20 953100441600
21 3220293856320
22 10880587258614

List of values

[12, 864, 1872, 4056, 13104, 42336, 138600, 453750, 1506450, 5001414, 16784592, 56328576, 190035408, 641121414, 2165870262, 7316857446, 24718829850, 83508603750, 282120696000, 953100441600, 3220293856320, 10880587258614]

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

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