Number of (n+2) X (5+2) 0..2 arrays with every 3 X 3 subblock row and column sum 2 3 or 4 and every diagonal and antidiagonal sum not 2 3 or 4.
A252225
Number of (n+2) X (5+2) 0..2 arrays with every 3 X 3 subblock row and column sum 2 3 or 4 and every diagonal and antidiagonal sum not 2 3 or 4.
Terms
- a(0) =2458a(1) =22256a(2) =73826a(3) =160688a(4) =412514a(5) =1339010a(6) =4297634a(7) =13186856a(8) =40282992a(9) =123998850a(10) =382415504a(11) =1178020562a(12) =3627007218a(13) =11168774306a(14) =34396342056a(15) =105928920848a(16) =326217328994
External references
- oeis: A252225