cp's OEIS Frontend

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.

A278634 T(n,k)=Number of nXk 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 0
2 0
3 0
4 1
5 13
6 1
7 15
8 285
9 285
10 15
11 90
12 3354
13 10824
14 3354
15 90
16 357
17 27521
18 234484
19 234484
20 27521
21 357
22 1107
23 175881
24 3739008
25 10776210
26 3739008
27 175881
28 1107
29 2907
30 932205
31 48592635
32 387551595
33 387551595
34 48592635
35 932205
36 2907
37 6765
38 4266912

List of values

[0, 0, 0, 1, 13, 1, 15, 285, 285, 15, 90, 3354, 10824, 3354, 90, 357, 27521, 234484, 234484, 27521, 357, 1107, 175881, 3739008, 10776210, 3739008, 175881, 1107, 2907, 932205, 48592635, 387551595, 387551595, 48592635, 932205, 2907, 6765, 4266912]

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

Content is available under The OEIS End-User License Agreement.