Number of (n+2)X(6+2) 0..3 arrays with every 3X3 subblock row and column sum nonprime and every diagonal and antidiagonal sum prime.
A251843
Number of (n+2)X(6+2) 0..3 arrays with every 3X3 subblock row and column sum nonprime and every diagonal and antidiagonal sum prime.
Terms
- a(0) =1951a(1) =5438a(2) =21748a(3) =48692a(4) =277125a(5) =1226031a(6) =2726048a(7) =16168331a(8) =74290304a(9) =163730464a(10) =998856517a(11) =4693337366a(12) =10286321048a(13) =63845445267a(14) =303868751600a(15) =663861257682
External references
- oeis: A251843