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.

A251972 Number of (n+1) X (6+1) 0..3 arrays with nondecreasing sum of every two consecutive values in every row and column.

Table of values

n a(n)
1 490000
2 60025000
3 7353062500
4 345888060000
5 16270574342400
6 410018473428480
7 10332465530397696
8 167006381634183168
9 2699368454168838144
10 31245878471405875200
11 361679014193888160000
12 3225176243350261200000

List of values

[490000, 60025000, 7353062500, 345888060000, 16270574342400, 410018473428480, 10332465530397696, 167006381634183168, 2699368454168838144, 31245878471405875200, 361679014193888160000, 3225176243350261200000]

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

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