Number of (n+2) X (1+2) 0..3 arrays with every 3 X 3 subblock row, column, diagonal and antidiagonal sum not equal to 0 3 4 6 or 7.
A252132
Number of (n+2) X (1+2) 0..3 arrays with every 3 X 3 subblock row, column, diagonal and antidiagonal sum not equal to 0 3 4 6 or 7.
Terms
- a(0) =172a(1) =134a(2) =209a(3) =439a(4) =909a(5) =1864a(6) =3905a(7) =8406a(8) =18168a(9) =39279a(10) =85291a(11) =186213a(12) =407616a(13) =893115a(14) =1958970a(15) =4302138a(16) =9455841a(17) =20792427a(18) =45735313a(19) =100630844a(20) =221468341a(21) =487479454a(22) =1073112928a(23) =2362493679a(24) =5201444067a(25) =11452406745a(26) =25216409792
External references
- oeis: A252132