Number of (5+2)X(n+2) 0..3 arrays with every 3X3 subblock row and diagonal sum equal to 0 2 4 6 or 7 and every 3X3 column and antidiagonal sum not equal to 0 2 4 6 or 7.
A252438
Number of (5+2)X(n+2) 0..3 arrays with every 3X3 subblock row and diagonal sum equal to 0 2 4 6 or 7 and every 3X3 column and antidiagonal sum not equal to 0 2 4 6 or 7.
Terms
- a(0) =1152a(1) =2993a(2) =9643a(3) =20187a(4) =85563a(5) =302218a(6) =652210a(7) =2786331a(8) =9882896a(9) =21364917a(10) =91892076a(11) =329431402a(12) =713269143a(13) =3086478489a(14) =11174739662a(15) =24228015605a(16) =105441386320a(17) =385277405784a(18) =836364909521
External references
- oeis: A252438