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

A251824

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

Terms

    a(0) =9354a(1) =28202a(2) =130826a(3) =397474a(4) =2395590a(5) =12830794a(6) =38456182a(7) =258040386a(8) =1458543158a(9) =4283605290a(10) =30490194918a(11) =176827937410a(12) =511836962950

External references