'nice' and 'nonn'/'sign'

[N. J. A. Sloane]

Here's how those keywords have evolved over the years

nonn means "nonn as far as is shown"

if there are minus signs a long way out, it is still "nonn"


"nice" is subjective!

if you claim a sequence is nice then the chances
are that I will agree with you, unless it obviously isn't nice!

Like i say, subjective!



By the way, "uned" presently means "oh dear, i just don't have
time to figure out what this is supposed to mean and
would someone please figure it out and send in a better description"


incidentally the tail of the database contains a bunch
of nice sequences based on finitie automata in
S. Wolfram's new book  (A new kind of science)
many of which need extending


here's a typical example:

%I A070950
%S A070950 1,1,1,1,1,1,0,0,1,1,1,0,1,1,1,1,1,1,0,0,1,0,0,0,1
%N A070950 Triangle giving successive states of cellular automaton generated by "rule 30".
%C A070950 If cell and right-hand neighbor are both 0 then new state of cell = state of left-hand neighbor; otherwise new state is complement of that of left-hand neighbor.
%C A070950 A simple rule which produces apparently random behavior. "... probably the single most surprising discovery I have ever made" - Steven Wolfram.
%C A070950 Row n has length 2n+1.
%D A070950 S. Wolfram, A New Kind of Science, Wolfram Media, 2002; p. 27.
%e A070950 1; 1,1,1; 1,1,0,0,1; 1,1,0,1,1,1,1; ...
%Y A070950 Cf. A070951, A070952.
%K A070950 nonn,tabf,nice,easy,more,new
%O A070950 0,1
%A A070950 njas, May 19 2002


I will be away from email May 29 - June 02


Neil Sloane