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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.

A221622 Number of nX7 arrays with each row a permutation of 1..7 having at least as many downsteps as the preceding row.

Table of values

n a(n)
1 5040
2 17052210
3 49096652080
4 130516916069715
5 332469512259607296
6 827196295133181978340
7 2031241364747667201263520
8 4951481629224145844957738085
9 12021159412525485182456506260880

List of values

[5040, 17052210, 49096652080, 130516916069715, 332469512259607296, 827196295133181978340, 2031241364747667201263520, 4951481629224145844957738085, 12021159412525485182456506260880]

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

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