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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.

A177657 Number of permutations of 4 copies of 1..n avoiding adjacent step pattern up, down, down, down, down, down.

Original entry on oeis.org

1, 1, 70, 34650, 63063000, 305540235000, 3244612572406800, 66346172137847738628
Offset: 0

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Author

R. H. Hardin, May 10 2010

Keywords

Crossrefs

Cf. A014608.

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