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A137342 Number of rational series having complexity n over the finite field F_2 in two non-commuting variables. 2
1, 4, 240, 52032, 37961472, 95557604352, 873176389545984, 30234012628981334016, 4073184753921806027390976, 2164965110784257951109280432128, 4571419424684923104187906920444592128 (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

R. Bacher, The special subgroup of invertible non-commutative rational power series as a metric group, arXiv:0804.1092

FORMULA

The reference contains a somewhat complicated formula.

CROSSREFS

Sequence in context: A051753 A323996 A094073 * A152793 A042769 A091792

Adjacent sequences:  A137339 A137340 A137341 * A137343 A137344 A137345

KEYWORD

nonn

AUTHOR

Roland Bacher, Apr 08 2008

STATUS

approved

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Last modified August 23 12:25 EDT 2019. Contains 326222 sequences. (Running on oeis4.)