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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.

A278627 T(n,k)=Number of nXk 0..2 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 0
2 3
3 3
4 16
5 46
6 16
7 51
8 357
9 357
10 51
11 126
12 1952
13 4754
14 1952
15 126
16 266
17 8518
18 49503
19 49503
20 8518
21 266
22 504
23 31605
24 439446
25 1069536
26 439446
27 31605
28 504
29 882
30 103546
31 3438414
32 21121532
33 21121532
34 3438414
35 103546
36 882
37 1452
38 307087
39 24103803

List of values

[0, 3, 3, 16, 46, 16, 51, 357, 357, 51, 126, 1952, 4754, 1952, 126, 266, 8518, 49503, 49503, 8518, 266, 504, 31605, 439446, 1069536, 439446, 31605, 504, 882, 103546, 3438414, 21121532, 21121532, 3438414, 103546, 882, 1452, 307087, 24103803]

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

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