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.

A123823 Number of ways to build a contiguous building with n LEGO blocks of size 2 X 2 on top of a fixed block of the same size so that the building is symmetric after a rotation by 90 degrees.

Table of values

n a(n)
1 1
2 1
3 1
4 2
5 3
6 4
7 5
8 11
9 22
10 34
11 47
12 113

List of values

[1, 1, 1, 2, 3, 4, 5, 11, 22, 34, 47, 113]

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

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