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.

A221668 Sum of neighbor maps: number of 3Xn binary arrays indicating the locations of corresponding elements equal to the sum mod 3 of their horizontal, diagonal and antidiagonal neighbors in a random 0..2 3Xn array.

Table of values

n a(n)
1 8
2 48
3 512
4 3772
5 31744
6 262144
7 2097152
8 16728064
9 134140928
10 1073741824
11 8587837440
12 68719476736
13 549755813888
14 4397939335680
15 35184372088832
16 281474976710656
17 2251796592459776
18 18014398509481984
19 144115185909972992

List of values

[8, 48, 512, 3772, 31744, 262144, 2097152, 16728064, 134140928, 1073741824, 8587837440, 68719476736, 549755813888, 4397939335680, 35184372088832, 281474976710656, 2251796592459776, 18014398509481984, 144115185909972992]

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

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