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A137343 Number of elements of length n with respect to the natural metric in the special group of rational series over the finite field F_2 in two non-commuting variables. 1
1, 12, 1296, 505536, 679848192, 3248147205120, 57637071142391808, 3930578658351563587584, 1050888530707010579202637824, 1112792971262327168651248131637248 (list; graph; refs; listen; history; text; internal format)
OFFSET
0,2
LINKS
Roland Bacher, Apr 08 2008, Table of n, a(n) for n = 0..14
FORMULA
The reference contains a somewhat complicated formula.
CROSSREFS
Sequence in context: A239164 A209176 A351630 * A133461 A246981 A174745
KEYWORD
nonn
AUTHOR
Roland Bacher, Apr 08 2008
STATUS
approved

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Last modified March 28 05:39 EDT 2024. Contains 371235 sequences. (Running on oeis4.)