Number of nX4 0..1 arrays with every element equal to 2, 3 or 4 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero.
A300461
Number of nX4 0..1 arrays with every element equal to 2, 3 or 4 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero.
Terms
- a(0) =0a(1) =4a(2) =8a(3) =28a(4) =142a(5) =540a(6) =2585a(7) =11343a(8) =51501a(9) =233028a(10) =1052448a(11) =4769842a(12) =21579345a(13) =97715668a(14) =442378911a(15) =2002838338a(16) =9067930634a(17) =41054700887a(18) =185876096558a(19) =841553822832
External references
- oeis: A300461