A133172 Species of unordered Latin bi-trades of size n.

0, 0, 0, 1, 0, 1, 1, 5, 3, 17, 19, 131, 262, 1448, 5743, 34514, 194239, 1302209, 9011123

Offset

1,8

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: A184537 A187809 A092893 * A363686 A075453 A349118

Adjacent sequences: A133169 A133170 A133171 * A133173 A133174 A133175

Keyword

nonn,more

Author

Ian Wanless, Oct 11 2007

Status

approved