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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.

A278414 T(n,k)=Number of nXk 0..2 arrays with rows and columns in lexicographic nondecreasing order but with exactly two mistakes.

Table of values

n a(n)
1 0
2 0
3 0
4 1
5 20
6 1
7 15
8 264
9 264
10 15
11 90
12 2550
13 9354
14 2550
15 90
16 357
17 22267
18 201539
19 201539
20 22267
21 357
22 1107
23 166762
24 3576730
25 11454780
26 3576730
27 166762
28 1107
29 2907
30 1046418
31 58069125
32 514122657
33 514122657
34 58069125
35 1046418
36 2907
37 6765
38 5586207

List of values

[0, 0, 0, 1, 20, 1, 15, 264, 264, 15, 90, 2550, 9354, 2550, 90, 357, 22267, 201539, 201539, 22267, 357, 1107, 166762, 3576730, 11454780, 3576730, 166762, 1107, 2907, 1046418, 58069125, 514122657, 514122657, 58069125, 1046418, 2907, 6765, 5586207]

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

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