Number of (n+2)X(2+2) 0..1 arrays with no 3x3 subblock diagonal sum 0 or 1 and no antidiagonal sum 0 or 1 and no row sum 1 and no column sum 1.

A256023

Number of (n+2)X(2+2) 0..1 arrays with no 3x3 subblock diagonal sum 0 or 1 and no antidiagonal sum 0 or 1 and no row sum 1 and no column sum 1.

Terms

    a(0) =68a(1) =164a(2) =484a(3) =1302a(4) =3500a(5) =9820a(6) =27424a(7) =76068a(8) =212126a(9) =592302a(10) =1651552a(11) =4606638a(12) =12854658a(13) =35865050a(14) =100061478a(15) =279186256a(16) =778969128a(17) =2173402654a(18) =6064060764a(19) =16919528420a(20) =47207600896a(21) =131715146500a(22) =367502127158

External references