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.

A221442 Hilltop maps: number of n X 4 binary arrays indicating the locations of corresponding elements not exceeded by any horizontal or antidiagonal neighbor in a random 0..1 n X 4 array.

Table of values

n a(n)
1 9
2 117
3 1465
4 18393
5 230845
6 2897357
7 36364977
8 456419681
9 5728560373
10 71899621813
11 902417942313
12 11326320232169
13 142157556964077
14 1784230940565533
15 22394026158604769
16 281069224947245681

List of values

[9, 117, 1465, 18393, 230845, 2897357, 36364977, 456419681, 5728560373, 71899621813, 902417942313, 11326320232169, 142157556964077, 1784230940565533, 22394026158604769, 281069224947245681]

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

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