OFFSET
1,2
COMMENTS
The sequence continues: a(23) = 8 or 9, a(24) = 8, 9 or 10, a(25) = 8 or 9, ...
REFERENCES
P. Gaborit and A. Otmani, Experimental construction of self-dual codes, Preprint.
LINKS
G. Nebe, E. M. Rains and N. J. A. Sloane, Self-Dual Codes and Invariant Theory, Springer, Berlin, 2006.
A. R. Calderbank, E. M. Rains, P. W. Shor and N. J. A. Sloane, Quantum error correction via codes over GF(4), arXiv:quant-ph/9608006, 1996-1997; IEEE Trans. Inform. Theory, 44 (1998), 1369-1387.
P. Gaborit, Tables of Self-Dual Codes
FORMULA
Conjectures from Chai Wah Wu, Apr 13 2024: (Start)
a(n) = a(n-1) + a(n-6) - a(n-7) for n > 7.
G.f.: x*(-2*x^6 + x^5 + x^4 + x + 1)/(x^7 - x^6 - x + 1). (End)
CROSSREFS
KEYWORD
nonn,more
AUTHOR
N. J. A. Sloane. Entry revised May 06 2005
STATUS
approved