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.

A123775 Number of ways to build a contiguous building with n LEGO blocks of size 1 X 3 on top of a fixed block of the same size so that the building is symmetric after a rotation by 180 degrees.

Table of values

n a(n)
1 2
2 8
3 24
4 115
5 451
6 2474
7 10377
8 60048
9 268402
10 1600292
11 7416480

List of values

[2, 8, 24, 115, 451, 2474, 10377, 60048, 268402, 1600292, 7416480]

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

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