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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.

A123805 Number of ways, counted up to symmetry, to build a contiguous building with n LEGO blocks of size 1 X 7 which is flat, i.e., with all blocks in parallel position, and symmetric after a rotation by 180 degrees.

Table of values

n a(n)
1 1
2 1
3 7
4 10
5 100
6 160
7 1688
8 2853
9 30903
10 53721
11 592395
12 1053025
13 11711448
14 21151575
15 236789391
16 432872895

List of values

[1, 1, 7, 10, 100, 160, 1688, 2853, 30903, 53721, 592395, 1053025, 11711448, 21151575, 236789391, 432872895]

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

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