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.

A123784 Number of ways to build a contiguous building with n LEGO blocks of size 1 X 4 on top of a fixed block of the same size so that the building is flat, i.e., with all blocks in parallel position.

Table of values

n a(n)
1 7
2 55
3 511
4 5000
5 51674
6 547204
7 5940045
8 65472189
9 731569499
10 8258444996
11 94045306573

List of values

[7, 55, 511, 5000, 51674, 547204, 5940045, 65472189, 731569499, 8258444996, 94045306573]

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

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