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

A252068

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

Terms

    a(0) =92a(1) =105a(2) =183a(3) =375a(4) =767a(5) =1573a(6) =3279a(7) =6994a(8) =15046a(9) =32452a(10) =70313a(11) =153169a(12) =334742a(13) =732720a(14) =1606016a(15) =3524854a(16) =7743783a(17) =17022376a(18) =37434303a(19) =82351952a(20) =181216059a(21) =398841171a(22) =877929646a(23) =1932693875a(24) =4255002737a(25) =9368295558a(26) =20627108406

External references