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A018925
Isotropic subspaces of a 2ndimensional unitary space over GF(4).
0
5, 85, 5525, 1419925
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OFFSET
1,1
REFERENCES
D. E. Taylor, The geometry of the classical groups, Heldermann Verlag, Berlin, 1992.
C. Bachoc and G. Nebe, Classification of two genera of 32dimensional lattices of rank 8 over the Hurwitz order, Experiment. Math. 6 (1997), 151162.
LINKS
Table of n, a(n) for n=1..4.
C. Bachoc and G. Nebe,
Classification of two genera of 32dimensional lattices of rank 8 over the Hurwitz order
, Experiment. Math. 6 (1997), 151162.
FORMULA
Conjecture: a(n) = Product_{k=1..n} (4^k + 1). 
Vaclav Kotesovec
, Nov 21 2015
CROSSREFS
Sequence in context:
A012815
A113107
A317355
*
A309327
A363424
A174320
Adjacent sequences:
A018922
A018923
A018924
*
A018926
A018927
A018928
KEYWORD
nonn
AUTHOR
N. J. A. Sloane
STATUS
approved
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Last modified April 22 09:42 EDT 2024. Contains 371894 sequences. (Running on oeis4.)