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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.

A197668 Number of nX4 0..4 arrays with each element x equal to the number its horizontal and vertical neighbors equal to 4,0,1,0,1 for x=0,1,2,3,4.

Table of values

n a(n)
1 5
2 71
3 546
4 5005
5 44323
6 403960
7 3675345
8 33272751
9 301565202
10 2734015025
11 24796812073
12 224875172500
13 2039110071283
14 18490725428895
15 167679905896100
16 1520586052304877
17 13789181642921163
18 125044668702632018

List of values

[5, 71, 546, 5005, 44323, 403960, 3675345, 33272751, 301565202, 2734015025, 24796812073, 224875172500, 2039110071283, 18490725428895, 167679905896100, 1520586052304877, 13789181642921163, 125044668702632018]

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

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