Q. about {0,1}-matrices.

[Klaus Brockhaus]

I wrote PARI code for sequence A125587, also "neither optimal nor verfied"; which confirms 1, 4, 68, 5008. It is now running to compute a(5), but of course I don't know how long that will take.

Klaus
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Ferenc Adorjan wrote:
> 
> Hello Neil and Seqfans,
> 
> I have composed a Pari program to determine the number of nxn robust
> 0,1 matrices.
> Certainly, the program below is neither optimal nor verfied. It
> provides properly the value of 4 and 68, but as the fourth term it
> gives 5440 instead of the value in your sequence (5008).