Number of nX3 0..1 arrays with every element unequal to 0, 1, 2 or 4 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero.
A318019
Number of nX3 0..1 arrays with every element unequal to 0, 1, 2 or 4 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero.
Terms
- a(0) =4a(1) =14a(2) =45a(3) =133a(4) =419a(5) =1382a(6) =4495a(7) =14754a(8) =48525a(9) =159584a(10) =524981a(11) =1727658a(12) =5685321a(13) =18710300a(14) =61576790a(15) =202655046a(16) =666960573a(17) =2195053580a(18) =7224214965a(19) =23775889227a(20) =78249787781a(21) =257531127865a(22) =847571571085
External references
- oeis: A318019