Number of 2 X n 0..1 arrays with the number of 1's horizontally, diagonally or antidiagonally adjacent to some 0 equal to the number of 0's adjacent to some 1, with top left element zero.
A284335
Number of 2 X n 0..1 arrays with the number of 1's horizontally, diagonally or antidiagonally adjacent to some 0 equal to the number of 0's adjacent to some 1, with top left element zero.
Terms
- a(0) =2a(1) =4a(2) =13a(3) =34a(4) =118a(5) =419a(6) =1481a(7) =5394a(8) =19848a(9) =73880a(10) =277222a(11) =1047495a(12) =3977615a(13) =15169751a(14) =58074521a(15) =223081286a(16) =859450114a(17) =3319751314a(18) =12852496680a(19) =49860496892a(20) =193783946748a(21) =754379484650
External references
- oeis: A284335