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.

A296321 Number of n X n 0..1 arrays with each 1 horizontally, vertically or antidiagonally adjacent to 2 neighboring 1's.

Table of values

n a(n)
1 1
2 3
3 11
4 61
5 853
6 20088
7 850404
8 72224019
9 11207386103
10 3245575984755
11 1784744625714267
12 1830394475306895557
13 3517200566091635085954
14 12698075318404649075573041
15 85871949097296276009847589332

List of values

[1, 3, 11, 61, 853, 20088, 850404, 72224019, 11207386103, 3245575984755, 1784744625714267, 1830394475306895557, 3517200566091635085954, 12698075318404649075573041, 85871949097296276009847589332]

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

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