%I #4 Mar 31 2012 12:35:55
%S 1,1,15,57,1033,6259,80851,844829,10894795,130817901,1781556515,
%T 23640849007,329173058411,4518115025537,63025886167079
%N Number of strings of n numbers x(i) in 7..7 with sums of x(i) and of x(i)*x(i+1) both zero
%C Column 7 of A183944
%e Some solutions for n=4
%e .3....0....1...7....0....2...4....1...6...4....1....0....4....6....0....3
%e .6...1....0....0...2....0....0....0....0....1....2...4...1....0....6....0
%e ..6....0....0....0....0....0....4...1....6....2...2....0...2....0....0....0
%e ..3....1...1....7....2...2....0....0....0....1...1....4...1...6...6...3
%K nonn
%O 1,3
%A _R. H. Hardin_ Jan 08 2011
