A137342 Number of rational series having complexity n over the finite field F_2 in two non-commuting variables.
1, 4, 240, 52032, 37961472, 95557604352, 873176389545984, 30234012628981334016, 4073184753921806027390976, 2164965110784257951109280432128, 4571419424684923104187906920444592128
Offset: 0
Keywords
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.