Number of (n+2)X(2+2) 0..3 arrays with every 3X3 subblock row and column sum not 1 3 6 or 8 and every diagonal and antidiagonal sum 1 3 6 or 8.

A252047

Number of (n+2)X(2+2) 0..3 arrays with every 3X3 subblock row and column sum not 1 3 6 or 8 and every diagonal and antidiagonal sum 1 3 6 or 8.

Terms

    a(0) =2440a(1) =2454a(2) =2552a(3) =3030a(4) =6136a(5) =10324a(6) =14924a(7) =28990a(8) =52526a(9) =86904a(10) =166166a(11) =299604a(12) =523624a(13) =1027446a(14) =1865496a(15) =3260232a(16) =6417036a(17) =11920442a(18) =21009316a(19) =40868422a(20) =76543446a(21) =136608534a(22) =264978112a(23) =496150830a(24) =889570920a(25) =1728995462a(26) =3244530418

External references