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

A251839

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

Terms

    a(0) =981a(1) =508a(2) =828a(3) =1229a(4) =2672a(5) =5438a(6) =9647a(7) =22610a(8) =47398a(9) =86279a(10) =204832a(11) =432320a(12) =789967a(13) =1882338a(14) =3983708a(15) =7285937a(16) =17386988a(17) =36844782a(18) =67409449a(19) =160977268a(20) =341342946a(21) =624601177a(22) =1492090228a(23) =3164874902a(24) =5791630811a(25) =13837769762a(26) =29355806776

External references