Number of (n+2)X(2+2) 0..3 arrays with every 3X3 subblock row and column sum not equal to 2 3 4 6 or 7 and every 3X3 diagonal and antidiagonal sum equal to 2 3 4 6 or 7.
A252272
Number of (n+2)X(2+2) 0..3 arrays with every 3X3 subblock row and column sum not equal to 2 3 4 6 or 7 and every 3X3 diagonal and antidiagonal sum equal to 2 3 4 6 or 7.
Terms
- a(0) =185a(1) =300a(2) =588a(3) =948a(4) =2154a(5) =4702a(6) =7922a(7) =18772a(8) =41890a(9) =71050a(10) =169992a(11) =381820a(12) =648406a(13) =1556716a(14) =3506186a(15) =5956360a(16) =14322682a(17) =32301418a(18) =54882446a(19) =132071184a(20) =298048144a(21) =506441784a(22) =1219178902a(23) =2752229560a(24) =4676738148a(25) =11260602630a(26) =25424209614
External references
- oeis: A252272