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

A252025

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

Terms

    a(0) =213a(1) =227a(2) =357a(3) =809a(4) =1805a(5) =4259a(6) =10251a(7) =24331a(8) =57385a(9) =135913a(10) =322129a(11) =763095a(12) =1807991a(13) =4283219a(14) =10146569a(15) =24037921a(16) =56947673a(17) =134911263a(18) =319611383a(19) =757175635a(20) =1793784697a(21) =4249564025a(22) =10067427977a(23) =23850227423a(24) =56502354463

External references