Number of -2..2 arrays x(i) of n+1 elements i=1..n+1 with x(i)+x(j), x(i+1)+x(j+1), -(x(i)+x(j+1)), and -(x(i+1)+x(j)) having one, two or three distinct values for every i<=n and j<=n.
A211462
Number of -2..2 arrays x(i) of n+1 elements i=1..n+1 with x(i)+x(j), x(i+1)+x(j+1), -(x(i)+x(j+1)), and -(x(i+1)+x(j)) having one, two or three distinct values for every i<=n and j<=n.
Terms
- a(0) =25a(1) =65a(2) =169a(3) =407a(4) =977a(5) =2283a(6) =5313a(7) =12259a(8) =28253a(9) =65023a(10) =149817a(11) =345739a(12) =799821a(13) =1855467a(14) =4317293a(15) =10077003a(16) =23592677a(17) =55403427a(18) =130474345a(19) =308095007a(20) =729314485a(21) =1730363331a(22) =4113892073a(23) =9798957667a(24) =23379161753a(25) =55863031875
External references
- oeis: A211462