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.

A180769 Half the number of nX9 binary arrays with each element equal to at least one neighbor.

Table of values

n a(n)
1 21
2 12377
3 3365327
4 953982820
5 273289411333
6 78060898850787
7 22310318523546774
8 6375989200126477033
9 1822180205677117048273
10 520757452730725828979262
11 148826239836327503673819877

List of values

[21, 12377, 3365327, 953982820, 273289411333, 78060898850787, 22310318523546774, 6375989200126477033, 1822180205677117048273, 520757452730725828979262, 148826239836327503673819877]

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

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