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.

A252071 Number of (n+2)X(4+2) 0..2 arrays with every 3X3 subblock row, column, diagonal and antidiagonal sum not equal to 0 3 or 4.

Table of values

n a(n)
1 375
2 1135
3 5085
4 21862
5 92225
6 391934
7 1669294
8 7114867
9 30309042
10 129016031
11 549319037
12 2339547000
13 9963141845
14 42425232250
15 180661430026
16 769335984173
17 3276146397838
18 13951092432179
19 59409215103993
20 252988054381898

List of values

[375, 1135, 5085, 21862, 92225, 391934, 1669294, 7114867, 30309042, 129016031, 549319037, 2339547000, 9963141845, 42425232250, 180661430026, 769335984173, 3276146397838, 13951092432179, 59409215103993, 252988054381898]

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

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