Number of (n+2)X(4+2) 0..3 arrays with every 3X3 subblock row and column sum 2 4 5 or 7 and every diagonal and antidiagonal sum not 2 4 5 or 7.
A251919
Number of (n+2)X(4+2) 0..3 arrays with every 3X3 subblock row and column sum 2 4 5 or 7 and every diagonal and antidiagonal sum not 2 4 5 or 7.
Terms
- a(0) =3260a(1) =4938a(2) =10820a(3) =25882a(4) =80438a(5) =253148a(6) =856022a(7) =3063064a(8) =10885914a(9) =39035588a(10) =141641316a(11) =513510222a(12) =1860892000a(13) =6752701006a(14) =24520021374a(15) =89037718964a(16) =323273690688
External references
- oeis: A251919