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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.

A213701 Half the number of 6X6 0..n symmetric arrays with no 2X2 subblock summing to 2n.

Table of values

n a(n)
1 5148
2 168382284
3 193946752094
4 34389632236877
5 2256314178023600
6 72037480156866493
7 1425762604012263360
8 19265705246048238885
9 196522537519121864954
10 1582723194473524459497
11 10592676749133340851406

List of values

[5148, 168382284, 193946752094, 34389632236877, 2256314178023600, 72037480156866493, 1425762604012263360, 19265705246048238885, 196522537519121864954, 1582723194473524459497, 10592676749133340851406]

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

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