Number of nXn 0..1 arrays with every element unequal to 0, 1 or 3 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero.
A317766
Number of nXn 0..1 arrays with every element unequal to 0, 1 or 3 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero.
Terms
- a(0) =1a(1) =3a(2) =5a(3) =10a(4) =19a(5) =40a(6) =75a(7) =159a(8) =310a(9) =600a(10) =1117a(11) =2146a(12) =4102a(13) =7866a(14) =14925a(15) =28415a(16) =54123a(17) =103279a(18) =196740a(19) =374715a(20) =713672a(21) =1359955a(22) =2591227a(23) =4936722a(24) =9404444a(25) =17916937a(26) =34135626a(27) =65035274
External references
- oeis: A317766