Number of (n+2)X(1+2) 0..4 arrays with every 3X3 subblock row and column sum nonprime and every diagonal and antidiagonal sum prime.
A252033
Number of (n+2)X(1+2) 0..4 arrays with every 3X3 subblock row and column sum nonprime and every diagonal and antidiagonal sum prime.
Terms
- a(0) =10991a(1) =31774a(2) =53776a(3) =112929a(4) =327823a(5) =1080979a(6) =2183207a(7) =5486634a(8) =16631787a(9) =51672060a(10) =114374144a(11) =303612703a(12) =922940376a(13) =2704035839a(14) =6383581782a(15) =17609747682a(16) =52579573030a(17) =148181650270a(18) =369603880321
External references
- oeis: A252033