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.

A123831 Number of ways to build a contiguous building with n LEGO blocks of size 2 X 4 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 24
3 88
4 1079
5 5563
6 74597
7 412309
8 5633649

List of values

[2, 24, 88, 1079, 5563, 74597, 412309, 5633649]

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

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