Number of nX4 0..1 arrays with each 1 horizontally, vertically or antidiagonally adjacent to 2 or 4 neighboring 1s.
A296537
Number of nX4 0..1 arrays with each 1 horizontally, vertically or antidiagonally adjacent to 2 or 4 neighboring 1s.
Terms
- a(0) =1a(1) =8a(2) =37a(3) =126a(4) =431a(5) =1554a(6) =5601a(7) =20036a(8) =71722a(9) =256991a(10) =920643a(11) =3297782a(12) =11813230a(13) =42316775a(14) =151584446a(15) =542999656a(16) =1945111540a(17) =6967686648a(18) =24959322680a(19) =89408160916a(20) =320273851760
External references
- oeis: A296537