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.

A183520 Number of n X 3 0..2 arrays with each element equal to either the sum mod 3 of its horizontal and vertical neighbors or the sum mod 3 of its diagonal and antidiagonal neighbors.

Table of values

n a(n)
1 5
2 31
3 101
4 543
5 2233
6 10003
7 47685
8 215451
9 994397
10 4603823
11 21240401
12 98257363
13 454235165
14 2100740935
15 9717553917
16 44943606231
17 207898873245
18 961691911899
19 4448501263357
20 20578124472715
21 95191234404373
22 440340646073843

List of values

[5, 31, 101, 543, 2233, 10003, 47685, 215451, 994397, 4603823, 21240401, 98257363, 454235165, 2100740935, 9717553917, 44943606231, 207898873245, 961691911899, 4448501263357, 20578124472715, 95191234404373, 440340646073843]

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

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