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.

A183713 1/20 of the number of (n+1) X 4 0..4 arrays with every 2 X 2 subblock strictly increasing clockwise or counterclockwise with one decrease.

Table of values

n a(n)
1 12
2 54
3 224
4 950
5 4012
6 16964
7 71712
8 303170
9 1281664
10 5418314
11 22906232
12 96837444
13 409385940
14 1730703022
15 7316648160
16 30931557950
17 130764969444
18 552816553732
19 2337064300200
20 9880075964922
21 41768598769664
22 176579193270290

List of values

[12, 54, 224, 950, 4012, 16964, 71712, 303170, 1281664, 5418314, 22906232, 96837444, 409385940, 1730703022, 7316648160, 30931557950, 130764969444, 552816553732, 2337064300200, 9880075964922, 41768598769664, 176579193270290]

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

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