A133175 Transposition classes of ordered Latin bi-trades of size n.

0, 0, 0, 1, 0, 2, 1, 9, 7, 40, 63, 401, 1202, 6503, 31512, 187798, 1138317, 7625934, 53764585

Offset

1,6

Links

Table of n, a(n) for n=1..19.

I. M. Wanless, A computer enumeration of small latin trades, Australas. J. Combin. 39, (2007) 247-258.

Crossrefs

Cf. A007083.

Sequence in context: A176400 A021459 A133169 * A188659 A042977 A198106

Adjacent sequences: A133172 A133173 A133174 * A133176 A133177 A133178

Keyword

nonn,more

Author

Ian Wanless, Oct 11 2007

Status

approved