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.

A250439 Number of (n+1)X(4+1) 0..2 arrays with nondecreasing sum of every two consecutive values in every row and column.

Table of values

n a(n)
1 3600
2 60000
3 1000000
4 8750000
5 76562500
6 450187500
7 2647102500
8 11859019200
9 53128406016
10 195165573120
11 716934758400
12 2263282560000
13 7144929000000
14 20012416875000
15 56053297265625
16 142499937937500
17 362266508890000

List of values

[3600, 60000, 1000000, 8750000, 76562500, 450187500, 2647102500, 11859019200, 53128406016, 195165573120, 716934758400, 2263282560000, 7144929000000, 20012416875000, 56053297265625, 142499937937500, 362266508890000]

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

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