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.

A183547 Number of n X 2 0..2 arrays with each element equal to either the maximum or the minimum of its horizontal and vertical neighbors.

Table of values

n a(n)
1 3
2 15
3 71
4 299
5 1325
6 5845
7 25785
8 113841
9 502523
10 2218399
11 9793287
12 43233099
13 190855613
14 842545925
15 3719480233
16 16419916497
17 72486917979
18 319998782959
19 1412657953559
20 6236281512443
21 27530519336653
22 121535484480133

List of values

[3, 15, 71, 299, 1325, 5845, 25785, 113841, 502523, 2218399, 9793287, 43233099, 190855613, 842545925, 3719480233, 16419916497, 72486917979, 319998782959, 1412657953559, 6236281512443, 27530519336653, 121535484480133]

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

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