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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.

A219081 Hilltop maps: number of 4Xn binary arrays indicating the locations of corresponding elements not exceeded by any horizontal, diagonal or antidiagonal neighbor in a random 0..1 4Xn array.

Table of values

n a(n)
1 1
2 149
3 2469
4 32945
5 494713
6 7561349
7 113959413
8 1715622809
9 25868247057
10 390055483301
11 5880485889397
12 88654851159857
13 1336593648057193
14 20150953522466741
15 303802286301958197
16 4580222640012373465

List of values

[1, 149, 2469, 32945, 494713, 7561349, 113959413, 1715622809, 25868247057, 390055483301, 5880485889397, 88654851159857, 1336593648057193, 20150953522466741, 303802286301958197, 4580222640012373465]

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

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