login

Reminder: The OEIS is hiring a new managing editor, and the application deadline is January 26.

Number of strings of n numbers x(i) in -6..6 with sums of x(i) and of x(i)*x(i+1) both zero
0

%I #4 Mar 31 2012 12:35:55

%S 1,1,13,51,761,4411,47675,442337,4838487,50772785,584627697,

%T 6723246423,79912390369,950827647493,11420632394717,137246445111917,

%U 1661603816786741

%N Number of strings of n numbers x(i) in -6..6 with sums of x(i) and of x(i)*x(i+1) both zero

%C Column 6 of A183944

%e Some solutions for n=4

%e ..0....4....0...-6....3...-3....1....4....0....5...-1....2....1....0...-1...-1

%e .-2....3....4....0....0....0....2....0...-6....0...-2....4....2...-1...-6....0

%e ..0...-6....0....0...-3....3....1...-4....0...-5....2...-4...-2....0....3....1

%e ..2...-1...-4....6....0....0...-4....0....6....0....1...-2...-1....1....4....0

%K nonn

%O 1,3

%A _R. H. Hardin_ Jan 08 2011