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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.

A278734 T(n,k)=Number of nXk 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 0
2 6
3 6
4 40
5 152
6 40
7 155
8 1947
9 1947
10 155
11 456
12 17352
13 58904
14 17352
15 456
16 1128
17 121520
18 1410818
19 1410818
20 121520
21 1128
22 2472
23 712406
24 28637916
25 99992428
26 28637916
27 712406
28 2472
29 4950
30 3633649
31 506031118
32 6410559865
33 6410559865
34 506031118

List of values

[0, 6, 6, 40, 152, 40, 155, 1947, 1947, 155, 456, 17352, 58904, 17352, 456, 1128, 121520, 1410818, 1410818, 121520, 1128, 2472, 712406, 28637916, 99992428, 28637916, 712406, 2472, 4950, 3633649, 506031118, 6410559865, 6410559865, 506031118]

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

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