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

KEYWORD

nonn

AUTHOR

Roland Bacher, Apr 08 2008

STATUS

approved