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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.

A219072 Hilltop maps: number of n X n binary arrays indicating the locations of corresponding elements not exceeded by any horizontal, diagonal or antidiagonal neighbor in a random 0..1 n X n array.

Table of values

n a(n)
1 1
2 11
3 337
4 32945
5 14228041
6 24734141495
7 167024618548071
8 4450580094888603089
9 469651231165595918842913
10 195869567064782965280559200707

List of values

[1, 11, 337, 32945, 14228041, 24734141495, 167024618548071, 4450580094888603089, 469651231165595918842913, 195869567064782965280559200707]

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

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