cp's OEIS Frontend

A188363 Number of arrangements of 8 numbers x(i) in -n..n with the sum of x(i)*x(i+1) equal to zero.

%I A188363 #6 Jul 22 2025 11:10:39
%S A188363 1477,37269,262925,1264985,3882729,11535493,25217201,55520361,
%T A188363 106276821,198605017,325986813,569829701,864406561
%N A188363 Number of arrangements of 8 numbers x(i) in -n..n with the sum of x(i)*x(i+1) equal to zero.
%C A188363 Row 7 of A188358
%e A188363 Some solutions for n=4
%e A188363 .-4...-4...-2...-4...-2...-1...-2...-3...-2...-1...-3...-4...-1...-4...-3...-3
%e A188363 .-4...-3...-3...-3...-4...-4...-3...-3...-3...-4...-4...-4...-3...-3...-4...-4
%e A188363 ..2....4....0....3....3....4...-4....0....0...-2....0....4...-2....0...-1....1
%e A188363 .-2....2....3...-1....2....1....4....3....2....0....2...-3....4...-1....4....4
%e A188363 ..4....4....2...-3...-2....0....0...-3....3...-3....3...-4...-3....3....0....2
%e A188363 ..1...-4....4....1...-1...-1....2....0....0...-4...-2....0...-1...-1...-1...-2
%e A188363 ..0...-3...-4....0....0...-4....1....0....3....3....2....0...-4...-2...-4....4
%e A188363 ..4....4....1....3...-2...-1...-4...-4...-4...-4...-4...-2...-1....4....4...-2
%K A188363 nonn
%O A188363 1,1
%A A188363 _R. H. Hardin_ Mar 28 2011