Number of (n+2)X(2+2) 0..2 arrays with every 3X3 subblock row, column, diagonal and antidiagonal sum not equal to 0 1 or 4.

A252287

Number of (n+2)X(2+2) 0..2 arrays with every 3X3 subblock row, column, diagonal and antidiagonal sum not equal to 0 1 or 4.

Terms

    a(0) =1130a(1) =1920a(2) =3848a(3) =8636a(4) =20213a(5) =49671a(6) =126017a(7) =325493a(8) =863661a(9) =2328733a(10) =6346689a(11) =17495936a(12) =48539226a(13) =135312021a(14) =378838196a(15) =1063219826a(16) =2989937045a(17) =8421698434a(18) =23744136508a(19) =67000696936a(20) =189183692883a(21) =534413085829

External references