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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.

A240004 Number of 5Xn 0..3 arrays with no element equal to one plus the sum of elements to its left or two plus the sum of the elements above it or one plus the sum of the elements diagonally to its northwest, modulo 4.

Table of values

n a(n)
1 66
2 1117
3 10405
4 86360
5 635873
6 4267171
7 26152051
8 147439332
9 775122753
10 3821059149
11 17769229031
12 78356711183
13 328981383567
14 1319877073978
15 5076715532082
16 18776009861766
17 66950026301586
18 230700526217982

List of values

[66, 1117, 10405, 86360, 635873, 4267171, 26152051, 147439332, 775122753, 3821059149, 17769229031, 78356711183, 328981383567, 1319877073978, 5076715532082, 18776009861766, 66950026301586, 230700526217982]

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

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