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.

A215872 Number of permutations of 0..floor((4*n-2)/2) on odd squares of an 4Xn array such that each row, column, diagonal and (downwards) antidiagonal of odd squares is increasing.

Table of values

n a(n)
1 1
2 1
3 1
4 4
5 10
6 78
7 262
8 3001
9 11694
10 170594
11 727846
12 12517074
13 56797272
14 1100044792
15 5219906670
16 110598847073
17 542976951374
18 12341741030502

List of values

[1, 1, 1, 4, 10, 78, 262, 3001, 11694, 170594, 727846, 12517074, 56797272, 1100044792, 5219906670, 110598847073, 542976951374, 12341741030502]

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

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