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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.

A221628 Number of 6Xn 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 7
3 7279
4 14576404
5 230141263315
6 7575106427737240
7 827196295133181978340
8 177037611175595181692394660
9 86030164534670200470739520304375
10 75149351745335662460465241596540458600

List of values

[1, 7, 7279, 14576404, 230141263315, 7575106427737240, 827196295133181978340, 177037611175595181692394660, 86030164534670200470739520304375, 75149351745335662460465241596540458600]

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

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