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.

A183712 1/20 of the number of (n+1) X 3 0..4 arrays with every 2 X 2 subblock strictly increasing clockwise or counterclockwise with one decrease.

Table of values

n a(n)
1 5
2 17
3 54
4 174
5 559
6 1797
7 5776
8 18566
9 59677
10 191821
11 616574
12 1981866
13 6370351
14 20476345
15 65817520
16 211558554
17 680016837
18 2185791545
19 7025832918
20 22583273462
21 72589861759
22 233327025821
23 749987665760
24 2410700161342
25 7748761123965
26 24906995867477

List of values

[5, 17, 54, 174, 559, 1797, 5776, 18566, 59677, 191821, 616574, 1981866, 6370351, 20476345, 65817520, 211558554, 680016837, 2185791545, 7025832918, 22583273462, 72589861759, 233327025821, 749987665760, 2410700161342, 7748761123965, 24906995867477]

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

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