Number of -2..2 arrays x(0..n-1) of n elements with zero sum and no two consecutive zero elements.
A199524
Number of -2..2 arrays x(0..n-1) of n elements with zero sum and no two consecutive zero elements.
Terms
- a(0) =1a(1) =4a(2) =18a(3) =72a(4) =320a(5) =1414a(6) =6346a(7) =28766a(8) =131246a(9) =602390a(10) =2777638a(11) =12857572a(12) =59712940a(13) =278096674a(14) =1298309782a(15) =6074112952a(16) =28470828008a(17) =133671581490a(18) =628526085270
External references
- oeis: A199524