Number of (n+2) X (1+2) 0..3 arrays with every 3 X 3 subblock row and diagonal sum equal to 1 3 4 6 or 7 and every 3 X 3 column and antidiagonal sum not equal to 1 3 4 6 or 7.
A252543
Number of (n+2) X (1+2) 0..3 arrays with every 3 X 3 subblock row and diagonal sum equal to 1 3 4 6 or 7 and every 3 X 3 column and antidiagonal sum not equal to 1 3 4 6 or 7.
Terms
- a(0) =478a(1) =850a(2) =2142a(3) =4644a(4) =13104a(5) =33852a(6) =73800a(7) =208992a(8) =540792a(9) =1179792a(10) =3342528a(11) =8650992a(12) =18874656a(13) =53477760a(14) =138412512a(15) =301990464a(16) =855638784a(17) =2214593472a(18) =4831839360a(19) =13690209792a(20) =35433482112a(21) =77309413632a(22) =219043335168
External references
- oeis: A252543