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.

A275561 Number of n X 4 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 96
3 294
4 1176
5 4056
6 15000
7 54150
8 196566
9 714150
10 2589894
11 9405024
12 34129350
13 123887616
14 449661894
15 1632114294
16 5924052504
17 21502190976
18 78045783606
19 283279234776
20 1028207094936
21 3732040069656
22 13546029168150
23 49167456532134

List of values

[6, 96, 294, 1176, 4056, 15000, 54150, 196566, 714150, 2589894, 9405024, 34129350, 123887616, 449661894, 1632114294, 5924052504, 21502190976, 78045783606, 283279234776, 1028207094936, 3732040069656, 13546029168150, 49167456532134]

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

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