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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.

A278733 Number of n X 7 0..3 arrays with rows in nondecreasing lexicographic order and columns in nonincreasing lexicographic order, but with exactly one mistake.

Table of values

n a(n)
1 2472
2 3633649
3 7907770636
4 19983433877142
5 50067074390669892
6 119979123054325787300
7 276347089984710259199248
8 616342267580395469193910007

List of values

[2472, 3633649, 7907770636, 19983433877142, 50067074390669892, 119979123054325787300, 276347089984710259199248, 616342267580395469193910007]

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

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