Number of (n+2)X(4+2) 0..3 arrays with every 3X3 subblock row and diagonal sum equal to 0 2 5 6 or 7 and every 3X3 column and antidiagonal sum not equal to 0 2 5 6 or 7.
A252675
Number of (n+2)X(4+2) 0..3 arrays with every 3X3 subblock row and diagonal sum equal to 0 2 5 6 or 7 and every 3X3 column and antidiagonal sum not equal to 0 2 5 6 or 7.
Terms
- a(0) =1246a(1) =1525a(2) =3424a(3) =7747a(4) =22203a(5) =56318a(6) =136414a(7) =396057a(8) =1018638a(9) =2491848a(10) =7256099a(11) =18740823a(12) =45930118a(13) =133764096a(14) =345973229a(15) =848474793a(16) =2470203352a(17) =6393928103a(18) =15686518177a(19) =45650583739a(20) =118239174725a(21) =290168205360a(22) =844090916262
External references
- oeis: A252675