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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.

A123780 Number of ways, counted up to symmetry, to build a contiguous building with n LEGO blocks of size 1 X 4 which is flat, i.e., with all blocks in parallel position.

Table of values

n a(n)
1 1
2 4
3 33
4 294
5 2951
6 30668
7 328999
8 3596934
9 39932206
10 448517488
11 5086259884
12 58135266335

List of values

[1, 4, 33, 294, 2951, 30668, 328999, 3596934, 39932206, 448517488, 5086259884, 58135266335]

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

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