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.

A225980 Number of nX6 binary arrays whose sum with another nX6 binary array containing no more than two 1s has rows and columns in lexicographically nondecreasing order.

Table of values

n a(n)
1 42
2 790
3 16361
4 361361
5 7718077
6 148890101
7 2513743785
8 36836074434
9 470279869497
10 5279223820491
11 52686610737385
12 472630223607623
13 3849896640784837
14 28735919289705656
15 198113452132002555

List of values

[42, 790, 16361, 361361, 7718077, 148890101, 2513743785, 36836074434, 470279869497, 5279223820491, 52686610737385, 472630223607623, 3849896640784837, 28735919289705656, 198113452132002555]

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

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