-1 -1 1 1 -1 -1 1 1 -1 -1 1 1 -1 -1 1 1 -1 -1 1 1 -1 -1 1 1 -1 -

[Edwin Clark]

Strangely enough this sequence does not seem to appear in the EIS.
Is this an oversight on my part, or is it really missing?

In this case a(n) = the sign of prod(i-j, 1<=i<j<=n+1) , offset = 1,
=sign of det of the vandermonde matrix of -1,-2,..., -(n+1).
And there must be other interesting interpretations of it.

I noticed this when looking at Benoit's recent binomial determinant.

I also noticed that when I search for it I got LOTS(!) of irrelevant
sequences for some reason.

Edwin