Number of (n+2)X(1+2) 0..3 arrays with every 3X3 subblock row, column, diagonal and antidiagonal sum not equal to 0 2 4 6 or 7.
A252450
Number of (n+2)X(1+2) 0..3 arrays with every 3X3 subblock row, column, diagonal and antidiagonal sum not equal to 0 2 4 6 or 7.
Terms
- a(0) =661a(1) =228a(2) =323a(3) =747a(4) =1731a(5) =3938a(6) =9013a(7) =20820a(8) =48122a(9) =111079a(10) =256713a(11) =594491a(12) =1378368a(13) =3198521a(14) =7429788a(15) =17277634a(16) =40219359a(17) =93711513a(18) =218547089a(19) =510131978a(20) =1191760983a(21) =2786416350a(22) =6519837310a(23) =15266746829a(24) =35773378779a(25) =83880640135
External references
- oeis: A252450