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.

A123827 Number of ways to build a contiguous building with n LEGO blocks of size 2 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 1
2 13
3 25
4 352
5 1006
6 15510
7 46928
8 744211
9 2479362

List of values

[1, 13, 25, 352, 1006, 15510, 46928, 744211, 2479362]

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

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