Number of (n+2)X(1+2) 0..3 arrays with every 3X3 subblock row and diagonal sum equal to 1 2 5 6 or 7 and every 3X3 column and antidiagonal sum not equal to 1 2 5 6 or 7.

A252567

Number of (n+2)X(1+2) 0..3 arrays with every 3X3 subblock row and diagonal sum equal to 1 2 5 6 or 7 and every 3X3 column and antidiagonal sum not equal to 1 2 5 6 or 7.

Terms

    a(0) =702a(1) =742a(2) =890a(3) =1469a(4) =2637a(5) =4583a(6) =8279a(7) =15476a(8) =28007a(9) =51488a(10) =96898a(11) =176973a(12) =326583a(13) =615240a(14) =1126387a(15) =2079411a(16) =3916443a(17) =7178360a(18) =13247301a(19) =24939892a(20) =45753026a(21) =84395129a(22) =158816016a(23) =291599929a(24) =537626773a(25) =1011287507a(26) =1858330859a(27) =3424706510

External references