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

A252112

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

Terms

    a(0) =2058a(1) =788a(2) =1634a(3) =2658a(4) =6070a(5) =9834a(6) =17772a(7) =38610a(8) =70968a(9) =132528a(10) =284488a(11) =536928a(12) =1021632a(13) =2178336a(14) =4172160a(15) =8018688a(16) =17036416a(17) =32884224a(18) =63532032a(19) =134730240a(20) =261101568a(21) =505786368a(22) =1071597568a(23) =2080923648a(24) =4036411392a(25) =8547803136

External references