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.

A222446 Sum of neighbor maps: number of nX3 binary arrays indicating the locations of corresponding elements equal to the sum mod 4 of their horizontal, vertical and antidiagonal neighbors in a random 0..3 nX3 array.

Table of values

n a(n)
1 8
2 64
3 420
4 4056
5 32720
6 262104
7 2082688
8 16777216
9 134217728
10 1073741824
11 8588539008
12 68719476736
13 549755813888
14 4398046511104
15 35184256942080
16 281474976587776
17 2251799813537792
18 18014398509359104
19 144115179143299072

List of values

[8, 64, 420, 4056, 32720, 262104, 2082688, 16777216, 134217728, 1073741824, 8588539008, 68719476736, 549755813888, 4398046511104, 35184256942080, 281474976587776, 2251799813537792, 18014398509359104, 144115179143299072]

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

Content is available under The OEIS End-User License Agreement.