Number of 3 X n 0..1 arrays with every 1 horizontally, diagonally or antidiagonally adjacent to 1 or 4 neighboring 1's.
A297584
Number of 3 X n 0..1 arrays with every 1 horizontally, diagonally or antidiagonally adjacent to 1 or 4 neighboring 1's.
Terms
- a(0) =1a(1) =9a(2) =36a(3) =72a(4) =188a(5) =688a(6) =2085a(7) =5497a(8) =16037a(9) =49553a(10) =144816a(11) =413800a(12) =1217824a(13) =3611968a(14) =10551977a(15) =30756729a(16) =90335433a(17) =265402081a(18) =776832420a(19) =2274331728a(20) =6670542132a(21) =19558546400a(22) =57298805509a(23) =167902287673a(24) =492193237461
External references
- oeis: A297584