Number of 4 X n 0..1 arrays with every 1 horizontally, diagonally or antidiagonally adjacent to 1 neighboring 1.
A297397
Number of 4 X n 0..1 arrays with every 1 horizontally, diagonally or antidiagonally adjacent to 1 neighboring 1.
Terms
- a(0) =1a(1) =20a(2) =57a(3) =126a(4) =700a(5) =2569a(6) =7779a(7) =31081a(8) =117084a(9) =400727a(10) =1478944a(11) =5485580a(12) =19599269a(13) =71231855a(14) =261062287a(15) =945122754a(16) =3430304343a(17) =12504256178a(18) =45424857782a(19) =164983194009a(20) =600231458537
External references
- oeis: A297397