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.

A185560 1/4 the number of n X n 0..3 arrays with no element equal both to the element above and to the element to its left.

Table of values

n a(n)
1 1
2 60
3 50580
4 598507920
5 99407416968000
6 231753101877188629380
7 7583858300260627032845531520
8 3483475434832751291309593655505225600
9 22459143127863154464679826472043109609252549520

List of values

[1, 60, 50580, 598507920, 99407416968000, 231753101877188629380, 7583858300260627032845531520, 3483475434832751291309593655505225600, 22459143127863154464679826472043109609252549520]

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

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