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.

A280957 Number of nX4 0..2 arrays with no element equal to more than one of its horizontal, vertical and antidiagonal neighbors and with new values introduced in order 0 sequentially upwards.

Table of values

n a(n)
1 11
2 205
3 1554
4 14106
5 126267
6 1121528
7 9986376
8 88940022
9 791997382
10 7052519878
11 62801413162
12 559236961207
13 4979918315253
14 44345374930680
15 394888443546716
16 3516418473800700
17 31313145020210260
18 278838553941378885

List of values

[11, 205, 1554, 14106, 126267, 1121528, 9986376, 88940022, 791997382, 7052519878, 62801413162, 559236961207, 4979918315253, 44345374930680, 394888443546716, 3516418473800700, 31313145020210260, 278838553941378885]

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

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