OFFSET
1,3
LINKS
K. L. M. Adamyk, E. Holmes, G. R. Mayfield, D. J. Moritz, M. Scheepers, B. E. Tenner, and H. C. Wauck, Sorting permutations: games, genomes, and cycles, arXiv:1410.2353 [math.CO], 2014.
C. A. Brown, C. S. Carrillo Vazquez, R. Goswami, S. Heil, M. Scheepers, The Sortability of Graphs and Matrices under Context Directed Swaps, arXiv:1904.03287 [math.CO], 2019.
EXAMPLE
a(3) = 4 because there are 4 cds-sortable permutations of {1,2,3}. These are, in one-line notation, 123, 132, 213, and 321.
CROSSREFS
KEYWORD
nonn,more
AUTHOR
Bridget Tenner, Dec 15 2014
EXTENSIONS
a(11)-a(14) from Paul Plummer, Jan 18 2015
STATUS
approved