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

A252069

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

Terms

    a(0) =105a(1) =152a(2) =419a(3) =1135a(4) =3029a(5) =8352a(6) =23091a(7) =63460a(8) =174704a(9) =481577a(10) =1326679a(11) =3654425a(12) =10068184a(13) =27738117a(14) =76416462a(15) =210524456a(16) =579990085a(17) =1597852627a(18) =4402027937a(19) =12127445290a(20) =33410714339a(21) =92045405682a(22) =253582052742a(23) =698610194521

External references