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.

A221448 Hilltop maps: number of 3Xn binary arrays indicating the locations of corresponding elements not exceeded by any horizontal or antidiagonal neighbor in a random 0..1 3Xn array.

Table of values

n a(n)
1 1
2 31
3 221
4 1465
5 10593
6 76055
7 543081
8 3883061
9 27769277
10 198564543
11 1419847869
12 10152784401
13 72598518713
14 519122981715
15 3712041493221
16 26543328598837
17 189800757263741
18 1357189525524527
19 9704721072833461
20 69394590298217165

List of values

[1, 31, 221, 1465, 10593, 76055, 543081, 3883061, 27769277, 198564543, 1419847869, 10152784401, 72598518713, 519122981715, 3712041493221, 26543328598837, 189800757263741, 1357189525524527, 9704721072833461, 69394590298217165]

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

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