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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.

A278631 Number of nX5 0..2 arrays with rows in nondecreasing lexicographic order and columns in nonincreasing lexicographic order, but with exactly two mistakes.

Table of values

n a(n)
1 90
2 27521
3 3739008
4 387551595
5 33967584488
6 2593097277036
7 175644502146694
8 10734760074025367
9 600850493598843960
10 31181144570813141891
11 1514424057857433189463
12 69299571270775145840652

List of values

[90, 27521, 3739008, 387551595, 33967584488, 2593097277036, 175644502146694, 10734760074025367, 600850493598843960, 31181144570813141891, 1514424057857433189463, 69299571270775145840652]

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

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