Number of n X 3 0..1 arrays with each 1 horizontally or vertically adjacent to 1, 3 or 4 1's.
A295546
Number of n X 3 0..1 arrays with each 1 horizontally or vertically adjacent to 1, 3 or 4 1's.
Terms
- a(0) =3a(1) =11a(2) =34a(3) =116a(4) =391a(5) =1304a(6) =4374a(7) =14645a(8) =49051a(9) =164353a(10) =550580a(11) =1844483a(12) =6179157a(13) =20700471a(14) =69348050a(15) =232320799a(16) =778290532a(17) =2607326895a(18) =8734723380a(19) =29261921589a(20) =98029444240a(21) =328405359664
External references
- oeis: A295546