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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.

A221629 Number of 7Xn 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 8
3 29124
4 183919920
5 15258126049410
6 2638115823321645192
7 2031241364747667201263520
8 3210318128660193294063849550080
9 13896214616394139128043246845049514250

List of values

[1, 8, 29124, 183919920, 15258126049410, 2638115823321645192, 2031241364747667201263520, 3210318128660193294063849550080, 13896214616394139128043246845049514250]

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

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