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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.

A204711 Number of (n+1)X7 0..1 arrays with the permanents of all 2X2 subblocks equal and nonzero.

Table of values

n a(n)
1 193
2 1361
3 8705
4 58449
5 382849
6 2542369
7 16748161
8 110871041
9 731709057
10 4838473473
11 31954317953
12 211206670209
13 1395251843713
14 9220409667201
15 60918293373569
16 402541765541505
17 2659689937121921
18 17574356285235841

List of values

[193, 1361, 8705, 58449, 382849, 2542369, 16748161, 110871041, 731709057, 4838473473, 31954317953, 211206670209, 1395251843713, 9220409667201, 60918293373569, 402541765541505, 2659689937121921, 17574356285235841]

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

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