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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.

A278381 Number of nX4 0..1 arrays with rows and columns in lexicographic nondecreasing order but with exactly three mistakes.

Table of values

n a(n)
1 0
2 40
3 1220
4 23640
5 368421
6 4703562
7 50473056
8 474255829
9 4047341159
10 32112086692
11 239321493757
12 1678998378973
13 11080464577870
14 68753466828933
15 401430915176013
16 2209957957528646
17 11503598362204972
18 56799460197673429

List of values

[0, 40, 1220, 23640, 368421, 4703562, 50473056, 474255829, 4047341159, 32112086692, 239321493757, 1678998378973, 11080464577870, 68753466828933, 401430915176013, 2209957957528646, 11503598362204972, 56799460197673429]

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

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