Complementary sequences (e.g.: 111010 and 000101) are taken to be equivalent. Related to maximum order complexity of sequences and also to number of incomplete paths in a De Bruijn graph
C. J. A. Jansen, Investigations On Nonlinear Stream cipher Systems: Construction and Evaluation Methods, Ph.D. Thesis, Delft University of Technology, The Netherlands (1989), pp. 58-81
Table of n, a(n) for n=0..4.
Sequence in context: A087234 A273965 A273961 * A217901 A127728 A306064
Adjacent sequences: A049535 A049536 A049537 * A049539 A049540 A049541
Cees J. A. Jansen (cja(AT)iae.nl)