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.

A251968 Number of (n+1) X (n+1) 0..3 arrays with nondecreasing sum of every two consecutive values in every row and column.

Table of values

n a(n)
1 256
2 20000
3 6250000
4 1500625000
5 922368160000
6 410018473428480
7 371968759094317056
8 244967687215822061568
9 286806250077948918890496
10 248333886971163312349814784
11 348300471444720308054703841536

List of values

[256, 20000, 6250000, 1500625000, 922368160000, 410018473428480, 371968759094317056, 244967687215822061568, 286806250077948918890496, 248333886971163312349814784, 348300471444720308054703841536]

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

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