Number of (n+2)X(1+2) 0..3 arrays with every 3X3 subblock row and column sum equal to 0 3 5 6 or 7 and every 3X3 diagonal and antidiagonal sum not equal to 0 3 5 6 or 7.

A252141

Number of (n+2)X(1+2) 0..3 arrays with every 3X3 subblock row and column sum equal to 0 3 5 6 or 7 and every 3X3 diagonal and antidiagonal sum not equal to 0 3 5 6 or 7.

Terms

    a(0) =1921a(1) =3026a(2) =5090a(3) =8132a(4) =14578a(5) =24855a(6) =44707a(7) =79081a(8) =140896a(9) =248042a(10) =450225a(11) =808657a(12) =1449166a(13) =2601931a(14) =4715098a(15) =8501478a(16) =15355964a(17) =27807534a(18) =50383383a(19) =91201345a(20) =165535742a(21) =300252624a(22) =544823562a(23) =989531463a(24) =1797603881a(25) =3264756294

External references