Number of (n+2)X(2+2) 0..2 arrays with every 3X3 subblock row, column, diagonal and antidiagonal sum not equal to 1 2 or 4.
A252059
Number of (n+2)X(2+2) 0..2 arrays with every 3X3 subblock row, column, diagonal and antidiagonal sum not equal to 1 2 or 4.
Terms
- a(0) =200a(1) =346a(2) =817a(3) =2081a(4) =5610a(5) =15593a(6) =43618a(7) =122839a(8) =347075a(9) =981466a(10) =2777062a(11) =7859985a(12) =22247952a(13) =62976844a(14) =178273840a(15) =504659106a(16) =1428597686a(17) =4044117989a(18) =11448226797a(19) =32408025216a(20) =91741786804a(21) =259705969673a(22) =735184974976
External references
- oeis: A252059