A279201 Number of Wilf-equivalence classes of square permutations of 2n things that avoid 123.

1, 2, 12, 118, 1218, 14272

Offset: 0

Author

N. J. A. Sloane, Dec 15 2016

Keywords

• nonn
• more

Links

• Samuele Giraudo, S. Vialette, Unshuffling Permutations, arXiv preprint arXiv:1601.05962 [cs.DS], 2016.

Crossrefs

Cf. A279200, A279202, A279203.