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.

A275567 Number of 4Xn 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 6
2 216
3 504
4 1176
5 3192
6 8664
7 23712
8 64896
9 180960
10 504600
11 1418100
12 3985350
13 11202990
14 31492086
15 88441764
16 248378136
17 697381260
18 1958065350
19 5498516310
20 15440588646
21 43363859406
22 121784495766
23 342029032494
24 960580887846

List of values

[6, 216, 504, 1176, 3192, 8664, 23712, 64896, 180960, 504600, 1418100, 3985350, 11202990, 31492086, 88441764, 248378136, 697381260, 1958065350, 5498516310, 15440588646, 43363859406, 121784495766, 342029032494, 960580887846]

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

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