Number of nX2 0..1 arrays with every element unequal to 0, 1, 2 or 4 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero.
A318018
Number of nX2 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) =2a(1) =6a(2) =14a(3) =35a(4) =95a(5) =257a(6) =700a(7) =1907a(8) =5202a(9) =14190a(10) =38712a(11) =105614a(12) =288137a(13) =786105a(14) =2144674a(15) =5851173a(16) =15963362a(17) =43551783a(18) =118819435a(19) =324167181a(20) =884403808a(21) =2412860224a(22) =6582846451a(23) =17959543175a(24) =48997829987a(25) =133677528403a(26) =364703530888
External references
- oeis: A318018