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.

A209680 Number of n X n 0..5 arrays with every element equal to a diagonal or antidiagonal reflection, and new values 0 upwards introduced in row major order.

Table of values

n a(n)
1 1
2 15
3 1508
4 6716352
5 66825091608
6 16894558898454012
7 7697358649459140517788
8 87677668153076602430717324907
9 1797666180378975423054345009058355238
10 921444360078430965633564486047727718449222837

List of values

[1, 15, 1508, 6716352, 66825091608, 16894558898454012, 7697358649459140517788, 87677668153076602430717324907, 1797666180378975423054345009058355238, 921444360078430965633564486047727718449222837]

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

Content is available under The OEIS End-User License Agreement.