Number of 4Xn 0..1 arrays avoiding 0 0 0 and 0 1 1 horizontally and 0 0 1 and 1 0 0 vertically.
A207501
Number of 4Xn 0..1 arrays avoiding 0 0 0 and 0 1 1 horizontally and 0 0 1 and 1 0 0 vertically.
Terms
- a(0) =9a(1) =81a(2) =297a(3) =1004a(4) =2942a(5) =7305a(6) =17911a(7) =40262a(8) =87990a(9) =187012a(10) =385400a(11) =783726a(12) =1564402a(13) =3084097a(14) =6019187a(15) =11629307a(16) =22307563a(17) =42493220a(18) =80468378a(19) =151622295a(20) =284370183a(21) =531240776a(22) =988874960a(23) =1834816342a(24) =3394683936a(25) =6264203818a(26) =11531988896
External references
- oeis: A207501