Number of (n+2)X(2+2) 0..3 arrays with every 3X3 subblock row and column sum equal to 0 3 5 6 or 8 and every 3X3 diagonal and antidiagonal sum not equal to 0 3 5 6 or 8.
A252328
Number of (n+2)X(2+2) 0..3 arrays with every 3X3 subblock row and column sum equal to 0 3 5 6 or 8 and every 3X3 diagonal and antidiagonal sum not equal to 0 3 5 6 or 8.
Terms
- a(0) =4006a(1) =5716a(2) =6222a(3) =9142a(4) =19540a(5) =40178a(6) =89296a(7) =225890a(8) =497694a(9) =1164378a(10) =3023806a(11) =6718012a(12) =15867518a(13) =41386930a(14) =92031834a(15) =218076968a(16) =570018794a(17) =1268404738a(18) =3011283796a(19) =7879627958a(20) =17542740780a(21) =41694280764a(22) =109139194282a(23) =243061709942
External references
- oeis: A252328