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.

A251970 Number of (n+1)X(4+1) 0..3 arrays with nondecreasing sum of every two consecutive values in every row and column.

Table of values

n a(n)
1 40000
2 1750000
3 76562500
4 1500625000
5 29412250000
6 345888060000
7 4067643585600
8 33470895790080
9 275417656786944
10 1738925256499200
11 10979183698560000
12 56483045388000000
13 290580293025000000

List of values

[40000, 1750000, 76562500, 1500625000, 29412250000, 345888060000, 4067643585600, 33470895790080, 275417656786944, 1738925256499200, 10979183698560000, 56483045388000000, 290580293025000000]

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

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