Number of -2..2 arrays x(0..n+1) of n+2 elements with zero sum and no two neighbors summing to zero.
A199826
Number of -2..2 arrays x(0..n+1) of n+2 elements with zero sum and no two neighbors summing to zero.
Terms
- a(0) =10a(1) =40a(2) =114a(3) =426a(4) =1650a(5) =6126a(6) =23206a(7) =88636a(8) =337866a(9) =1295566a(10) =4992364a(11) =19269156a(12) =74529210a(13) =288954786a(14) =1122363984a(15) =4366362420a(16) =17011617426a(17) =66365823648a(18) =259213619826
External references
- oeis: A199826