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

A252273

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

Terms

    a(0) =232a(1) =588a(2) =1407a(3) =2513a(4) =7803a(5) =20430a(6) =37160a(7) =121782a(8) =326774a(9) =596036a(10) =2008782a(11) =5462339a(12) =9969419a(13) =34147305a(14) =93561856a(15) =170807342a(16) =590374668a(17) =1624383132a(18) =2965903730a(19) =10301913228a(20) =28409142949a(21) =51875117033a(22) =180660686571a(23) =498797977816

External references