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.

A221619 Number of n X 4 arrays with each row a permutation of 1..4 having at least as many downsteps as the preceding row.

Table of values

n a(n)
1 24
2 410
3 6120
4 85035
5 1130256
6 14576404
7 183919920
8 2282493365
9 27960543720
10 338950264686
11 4073680032984
12 48607978698655
13 576460247379360
14 6800560019808680
15 79860630502888416
16 934066108666694889

List of values

[24, 410, 6120, 85035, 1130256, 14576404, 183919920, 2282493365, 27960543720, 338950264686, 4073680032984, 48607978698655, 576460247379360, 6800560019808680, 79860630502888416, 934066108666694889]

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

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