1,1
Stephen P Humphries, "Cogrowth groups and the Dedekind-Frobenius group determinant", Mathematical Proceeding of the Cambridge Philosophical Society volume 121 Part 2 pages 193-217 (1997).
Table of n, a(n) for n=1..12.
Sequence in context: A103179 A004077 A202743 * A097090 A085403 A112478
Adjacent sequences: A007982 A007983 A007984 * A007986 A007987 A007988
nonn
Stephen P. Humphries
approved