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.

A348848 Number of oriented polyominoes with 4n cells that have fourfold rotational symmetry centered at a vertex.

Table of values

n a(n)
1 1
2 2
3 6
4 19
5 65
6 224
7 790
8 2851
9 10424
10 38496
11 143454
12 538667
13 2035180
14 7729146
15 29486904
16 112942373
17 434114384
18 1673766428
19 6471199322
20 25081542410
21 97431694571
22 379256586232
23 1479022885116

List of values

[1, 2, 6, 19, 65, 224, 790, 2851, 10424, 38496, 143454, 538667, 2035180, 7729146, 29486904, 112942373, 434114384, 1673766428, 6471199322, 25081542410, 97431694571, 379256586232, 1479022885116]

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

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