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.

A196213 Number of nX3 0..4 arrays with each element x equal to the number its horizontal and vertical neighbors equal to 3,0,1,2,4 for x=0,1,2,3,4.

Table of values

n a(n)
1 4
2 20
3 58
4 290
5 1217
6 5110
7 21969
8 93666
9 399920
10 1714601
11 7351903
12 31469992
13 134862960
14 577985643
15 2477090793
16 10617586380
17 45512098214
18 195087643326
19 836266725394
20 3584843949857
21 15367390560222
22 65877090945921

List of values

[4, 20, 58, 290, 1217, 5110, 21969, 93666, 399920, 1714601, 7351903, 31469992, 134862960, 577985643, 2477090793, 10617586380, 45512098214, 195087643326, 836266725394, 3584843949857, 15367390560222, 65877090945921]

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

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