Number of (n+2)X(3+2) 0..3 arrays with every 3X3 subblock row and column sum prime and every diagonal and antidiagonal sum nonprime.
A251945
Number of (n+2)X(3+2) 0..3 arrays with every 3X3 subblock row and column sum prime and every diagonal and antidiagonal sum nonprime.
Terms
- a(0) =1933a(1) =1251a(2) =2272a(3) =3572a(4) =8756a(5) =21326a(6) =47034a(7) =116348a(8) =285990a(9) =648986a(10) =1600960a(11) =3954974a(12) =9038718a(13) =22223456a(14) =55101272a(15) =126511418a(16) =310210760a(17) =771368188a(18) =1777412512a(19) =4348909608a(20) =10838707484a(21) =25045428046a(22) =61176606276a(23) =152743298468
External references
- oeis: A251945