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.

A278303 Number of n X 2 0..2 arrays with rows and columns in lexicographic nondecreasing order but with exactly one mistake.

Table of values

n a(n)
1 3
2 32
3 294
4 2089
5 11486
6 51562
7 197981
8 672365
9 2068221
10 5862308
11 15508725
12 38669253
13 91572377
14 207221995
15 450353206
16 943885459
17 1914477373
18 3769095759
19 7220896420
20 13492019950
21 24634260906
22 44027466111
23 77141909955
24 132687309790

List of values

[3, 32, 294, 2089, 11486, 51562, 197981, 672365, 2068221, 5862308, 15508725, 38669253, 91572377, 207221995, 450353206, 943885459, 1914477373, 3769095759, 7220896420, 13492019950, 24634260906, 44027466111, 77141909955, 132687309790]

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

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