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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.

A204706 Number of (n+1)X(n+1) 0..1 arrays with the permanents of all 2X2 subblocks equal and nonzero.

Table of values

n a(n)
1 7
2 33
3 257
4 3473
5 73345
6 2542369
7 140090241
8 12503757969
9 1787244586881
10 411927241028353
11 152442345546739969
12 90819596095626887105
13 86960426240537811217921
14 133963874202574308172821153

List of values

[7, 33, 257, 3473, 73345, 2542369, 140090241, 12503757969, 1787244586881, 411927241028353, 152442345546739969, 90819596095626887105, 86960426240537811217921, 133963874202574308172821153]

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

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