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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.

A218419 Hilltop maps: number of n X n binary arrays indicating the locations of corresponding elements not exceeded by any horizontal, vertical or antidiagonal neighbor in a random 0..1 n X n array.

Table of values

n a(n)
1 1
2 13
3 357
4 41515
5 19003811
6 34328798853
7 245489633250861
8 6942897327251230265
9 776657742366634012014603
10 343639983448734808976866431015
11 601395784904377113605427806277106571

List of values

[1, 13, 357, 41515, 19003811, 34328798853, 245489633250861, 6942897327251230265, 776657742366634012014603, 343639983448734808976866431015, 601395784904377113605427806277106571]

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

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