1,2

Also number of plans (i.e. structural solutions) of the open shop problem with n jobs and n machines where the jobs may be interchanged with the machines - see problems in scheduling theory.

H. Braesel, M. Harborth, T. Tautenhahn and P. Willenius, On the set of solutions of the open shop problem, Ann. Oper. Res. 92 (1999) 241-263

M. Harborth, Structural analysis of shop scheduling problems, PhD thesis, Otto-von-Guericke-Univ. Magdeburg, GCA-Verlag, 1999 (in German)

Cf. A053870.

Sequence in context: A068250 A096126 A057599 this_sequence A139984 A057631 A058455

Adjacent sequences: A054580 A054581 A054582 this_sequence A054584 A054585 A054586

nonn,nice,hard

Martin Harborth (Martin.Harborth(AT)vt.siemens.de)