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.

A203101 T(n,k) = number of nXk 0..3 arrays with every nonzero element less than or equal to some horizontal or vertical neighbor.

Table of values

n a(n)
1 1
2 4
3 4
4 16
5 84
6 16
7 50
8 1080
9 1080
10 50
11 144
12 12260
13 48552
14 12260
15 144
16 422
17 143510
18 2029744
19 2029744
20 143510
21 422
22 1268
23 1705124
24 87531478
25 308642476
26 87531478
27 1705124
28 1268
29 3823
30 20174774
31 3790420430
32 48260497186
33 48260497186

List of values

[1, 4, 4, 16, 84, 16, 50, 1080, 1080, 50, 144, 12260, 48552, 12260, 144, 422, 143510, 2029744, 2029744, 143510, 422, 1268, 1705124, 87531478, 308642476, 87531478, 1705124, 1268, 3823, 20174774, 3790420430, 48260497186, 48260497186]

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

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