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.

A000409 Singular n X n (0,1)-matrices: the number of n X n (0,1)-matrices having distinct, nonzero ordered rows, but having at least two equal columns or at least one zero column.

Table of values

n a(n)
2 0
3 6
4 350
5 43260
6 14591171
7 14657461469
8 46173502811223
9 474928141312623525
10 16489412944755088235117
11 1985178211854071817861662307
12 846428472480689964807653763864449
13 1299141117072945982773752362381072143359
14 7268140170419155675761326840423792818571154945
15 149650282980396792665043455999899697765782372693740287

List of values

[0, 6, 350, 43260, 14591171, 14657461469, 46173502811223, 474928141312623525, 16489412944755088235117, 1985178211854071817861662307, 846428472480689964807653763864449, 1299141117072945982773752362381072143359, 7268140170419155675761326840423792818571154945, 149650282980396792665043455999899697765782372693740287]

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

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