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.

A278430 Number of nX2 0..3 arrays with rows and columns in lexicographic nondecreasing order but with exactly one mistake.

Table of values

n a(n)
1 6
2 100
3 1609
4 19624
5 178352
6 1287838
7 7795151
8 41058743
9 193149285
10 826734193
11 3264405727
12 12016477160
13 41579224479
14 136142690453
15 424140541353
16 1263030700894
17 3609095743983
18 9929303441355
19 26377932553959
20 67838309686132

List of values

[6, 100, 1609, 19624, 178352, 1287838, 7795151, 41058743, 193149285, 826734193, 3264405727, 12016477160, 41579224479, 136142690453, 424140541353, 1263030700894, 3609095743983, 9929303441355, 26377932553959, 67838309686132]

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

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