Number of (n+2)X(6+2) 0..3 arrays with every 3X3 subblock row and column sum 1 3 6 or 8 and every diagonal and antidiagonal sum not 1 3 6 or 8.
A252013
Number of (n+2)X(6+2) 0..3 arrays with every 3X3 subblock row and column sum 1 3 6 or 8 and every diagonal and antidiagonal sum not 1 3 6 or 8.
Terms
- a(0) =2458a(1) =4570a(2) =8930a(3) =16994a(4) =58970a(5) =159514a(6) =303906a(7) =1091906a(8) =2992258a(9) =5688946a(10) =20991418a(11) =58157050a(12) =110567106a(13) =415631962a(14) =1160467354a(15) =2206069826a(16) =8400830074a(17) =23579015866a(18) =44821554626a(19) =172160697370a(20) =484878952282a(21) =921675795266
External references
- oeis: A252013