Number of n X 2 arrays of occupancy after each element moves to some king-move neighbor, with every occupancy equal to zero or two.
A221270
Number of n X 2 arrays of occupancy after each element moves to some king-move neighbor, with every occupancy equal to zero or two.
Terms
- a(0) =0a(1) =6a(2) =16a(3) =52a(4) =174a(5) =588a(6) =1984a(7) =6688a(8) =22536a(9) =75924a(10) =255760a(11) =861496a(12) =2901696a(13) =9773184a(14) =32916280a(15) =110861104a(16) =373373568a(17) =1257492096a(18) =4235114944a(19) =14263430416a(20) =48037679232a(21) =161785483872a(22) =544874848384
External references
- oeis: A221270