Number of (n+2)X(1+2) 0..3 arrays with every 3X3 subblock row and diagonal sum equal to 0 3 4 6 or 7 and every 3X3 column and antidiagonal sum not equal to 0 3 4 6 or 7.

A252633

Number of (n+2)X(1+2) 0..3 arrays with every 3X3 subblock row and diagonal sum equal to 0 3 4 6 or 7 and every 3X3 column and antidiagonal sum not equal to 0 3 4 6 or 7.

Terms

    a(0) =572a(1) =687a(2) =1189a(3) =2230a(4) =4382a(5) =8697a(6) =17046a(7) =34424a(8) =69196a(9) =136906a(10) =278002a(11) =561138a(12) =1119260a(13) =2283480a(14) =4624958a(15) =9291788a(16) =19034708a(17) =38667770a(18) =78183568a(19) =160738190a(20) =327379782a(21) =665660970a(22) =1372806636a(23) =2802341926a(24) =5725582074a(25) =11839463788

External references