Number of (n+2)X(1+2) 0..4 arrays with every 3X3 subblock row and column sum prime and every diagonal and antidiagonal sum nonprime.

A251878

Number of (n+2)X(1+2) 0..4 arrays with every 3X3 subblock row and column sum prime and every diagonal and antidiagonal sum nonprime.

Terms

    a(0) =5495a(1) =11492a(2) =20025a(3) =49529a(4) =117744a(5) =256604a(6) =676969a(7) =1694929a(8) =3850641a(9) =10168955a(10) =25657626a(11) =58789576a(12) =154405779a(13) =390732438a(14) =900368454a(15) =2349009411a(16) =5954768481a(17) =13795315565a(18) =35777536598a(19) =90799627321a(20) =211393940417a(21) =545320046544

External references