Number of nX4 0..1 arrays with every element equal to 1, 2 or 3 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero.
A300423
Number of nX4 0..1 arrays with every element equal to 1, 2 or 3 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero.
Terms
- a(0) =2a(1) =30a(2) =272a(3) =2227a(4) =18205a(5) =150352a(6) =1240541a(7) =10232500a(8) =84410206a(9) =696309062a(10) =5743948074a(11) =47382634074a(12) =390866061898
External references
- oeis: A300423