A133174 Transposition classes of unordered Latin bi-trades of size n.

0, 0, 0, 1, 0, 2, 1, 9, 5, 36, 42, 313, 685, 3999, 16535, 100897, 577324, 3886229, 26982310

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: A361146 A067304 A103876 * A155545 A141618 A061691

Adjacent sequences: A133171 A133172 A133173 * A133175 A133176 A133177

Keyword

nonn,more

Author

Ian Wanless, Oct 11 2007

Status

approved