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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.

A133258 Number of possible 3 X n arrangements of black and white squares that can form the middle three rows in an n X n crossword puzzle with rotational symmetry. In this sequence, n is ODD.

Table of values

n a(n)
3 1
4 11
5 38
6 157
7 718
8 3039
9 12571

List of values

[1, 11, 38, 157, 718, 3039, 12571]

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

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