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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.

A177617 Number of permutations of 3 copies of 1..n avoiding adjacent step pattern up, down, down, down, down, up.

Original entry on oeis.org

1, 1, 20, 1680, 369600, 167510862, 135702841152, 178756061502340, 357729925926146006
Offset: 0

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Author

R. H. Hardin, May 10 2010

Keywords

Crossrefs

Cf. A014606.

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