Number of (2+2)X(n+2) 0..3 arrays with every 3X3 subblock row and diagonal sum equal to 1 3 4 6 or 7 and every 3X3 column and antidiagonal sum not equal to 1 3 4 6 or 7.
A252546
Number of (2+2)X(n+2) 0..3 arrays with every 3X3 subblock row and diagonal sum equal to 1 3 4 6 or 7 and every 3X3 column and antidiagonal sum not equal to 1 3 4 6 or 7.
Terms
- a(0) =850a(1) =3880a(2) =15480a(3) =43848a(4) =213120a(5) =881848a(6) =2568432a(7) =12681664a(8) =53297808a(9) =157483872a(10) =782763648a(11) =3314813344a(12) =9868152000a(13) =49199192320a(14) =209132201280a(15) =624968085888
External references
- oeis: A252546