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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.

A240457 Number of nX3 0..3 arrays with no element equal to one plus the sum of elements to its left or three plus the sum of elements above it or one plus the sum of the elements diagonally to its northwest, modulo 4.

Table of values

n a(n)
1 8
2 89
3 874
4 8187
5 75167
6 682018
7 6147372
8 55212526
9 494809053
10 4428808128
11 39611173178
12 354127003547
13 3165102684053
14 28284608888395
15 252739519980209
16 2258253806476180
17 20177086997089514
18 180275181902738316

List of values

[8, 89, 874, 8187, 75167, 682018, 6147372, 55212526, 494809053, 4428808128, 39611173178, 354127003547, 3165102684053, 28284608888395, 252739519980209, 2258253806476180, 20177086997089514, 180275181902738316]

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

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