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.

A123791 Number of ways to build a contiguous building with n LEGO blocks of size 1 X 5 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 16
3 56
4 552
5 2722
6 30836
7 164018
8 1941658

List of values

[2, 16, 56, 552, 2722, 30836, 164018, 1941658]

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

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