Number of (n+2) X (7+2) 0..3 arrays with every 3 X 3 subblock row and column sum not 2 3 6 or 7 and every diagonal and antidiagonal sum 2 3 6 or 7.
A251893
Number of (n+2) X (7+2) 0..3 arrays with every 3 X 3 subblock row and column sum not 2 3 6 or 7 and every diagonal and antidiagonal sum 2 3 6 or 7.
Terms
- a(0) =2146a(1) =1182a(2) =2478a(3) =4490a(4) =11762a(5) =17774a(6) =33218a(7) =84866a(8) =142178a(9) =265730a(10) =678914a(11) =1137410a(12) =2125826a(13) =5431298a(14) =9099266a(15) =17006594a(16) =43450370a(17) =72794114a(18) =136052738a(19) =347602946a(20) =582352898a(21) =1088421890a(22) =2780823554a(23) =4658823170a(24) =8707375106
External references
- oeis: A251893