2,1
R. Sedgewick, Permutation generation methods, Computing Surveys, 9 (1977), 137-164.
Sequence in context: A100766 A189541 A201233 * A089548 A146762 A190073
Adjacent sequences: A135845 A135846 A135847 * A135849 A135850 A135851
nonn
N. J. A. Sloane (njas(AT)research.att.com), Mar 07 2008