Number of (n+2)X(2+2) 0..3 arrays with every 3X3 subblock row and diagonal sum equal to 1 2 5 6 or 7 and every 3X3 column and antidiagonal sum not equal to 1 2 5 6 or 7.

A252568

Number of (n+2)X(2+2) 0..3 arrays with every 3X3 subblock row and diagonal sum equal to 1 2 5 6 or 7 and every 3X3 column and antidiagonal sum not equal to 1 2 5 6 or 7.

Terms

    a(0) =843a(1) =868a(2) =1558a(3) =3286a(4) =7610a(5) =17261a(6) =39419a(7) =94224a(8) =218717a(9) =504824a(10) =1216914a(11) =2842764a(12) =6585725a(13) =15930113a(14) =37308440a(15) =86581201a(16) =209741403a(17) =491769283a(18) =1142254876a(19) =2768731230a(20) =6494985545a(21) =15093638282a(22) =36592496037a(23) =85859457999a(24) =199589766685

External references