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.

A221627 Number of 5Xn arrays with each row a permutation of 1..n having at least as many downsteps as the preceding row.

Table of values

n a(n)
1 1
2 6
3 1818
4 1130256
5 3451956516
6 21241004664348
7 332469512259607296
8 9510929074212911717760
9 521875340203828179569609700
10 47602100904962622927705491352020
11 7181861163349151796773697873026037828

List of values

[1, 6, 1818, 1130256, 3451956516, 21241004664348, 332469512259607296, 9510929074212911717760, 521875340203828179569609700, 47602100904962622927705491352020, 7181861163349151796773697873026037828]

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

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