Number of (n+2) X (2+2) 0..1 arrays with no 3 x 3 subblock diagonal sum 0 or 1 and no antidiagonal sum 0 or 1 and no row sum 0 or 1 and no column sum 0 or 1.
A255021
Number of (n+2) X (2+2) 0..1 arrays with no 3 x 3 subblock diagonal sum 0 or 1 and no antidiagonal sum 0 or 1 and no row sum 0 or 1 and no column sum 0 or 1.
Terms
- a(0) =54a(1) =134a(2) =405a(3) =1121a(4) =3015a(5) =8338a(6) =23077a(7) =63446a(8) =174690a(9) =481563a(10) =1326665a(11) =3654411a(12) =10068170a(13) =27738103a(14) =76416448a(15) =210524442a(16) =579990071a(17) =1597852613a(18) =4402027923a(19) =12127445276a(20) =33410714325a(21) =92045405668a(22) =253582052728a(23) =698610194507
External references
- oeis: A255021