Number of (n+2)X(4+2) 0..3 arrays with every 3X3 subblock row and diagonal sum equal to 2 3 4 6 or 7 and every 3X3 column and antidiagonal sum not equal to 2 3 4 6 or 7.

A252403

Number of (n+2)X(4+2) 0..3 arrays with every 3X3 subblock row and diagonal sum equal to 2 3 4 6 or 7 and every 3X3 column and antidiagonal sum not equal to 2 3 4 6 or 7.

Terms

    a(0) =1551a(1) =1157a(2) =2555a(3) =6231a(4) =16906a(5) =44456a(6) =113146a(7) =311214a(8) =819606a(9) =2086566a(10) =5746545a(11) =15147605a(12) =38558032a(13) =106198296a(14) =280032267a(15) =712923101a(16) =1963719979a(17) =5179266001a(18) =13187734424a(19) =36328962794a(20) =95838112695a(21) =244064366602a(22) =672411482149

External references