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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.

A208175 T(n,k)=Number of nXk 0..3 arrays with new values 0..3 introduced in row major order and no element equal to more than one of its immediate leftward or upward neighbors.

Table of values

n a(n)
1 1
2 2
3 2
4 5
5 13
6 5
7 15
8 159
9 159
10 15
11 51
12 2277
13 8469
14 2277
15 51
16 187
17 33831
18 473928
19 473928
20 33831
21 187
22 715
23 506493
24 26625693
25 99752346
26 26625693
27 506493
28 715
29 2795
30 7594479
31 1496307201
32 21002874867
33 21002874867
34 1496307201
35 7594479
36 2795
37 11051

List of values

[1, 2, 2, 5, 13, 5, 15, 159, 159, 15, 51, 2277, 8469, 2277, 51, 187, 33831, 473928, 473928, 33831, 187, 715, 506493, 26625693, 99752346, 26625693, 506493, 715, 2795, 7594479, 1496307201, 21002874867, 21002874867, 1496307201, 7594479, 2795, 11051]

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

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