Number of (n+2) X (3+2) 0..3 arrays with every 3 X 3 subblock row and column sum equal to 0 2 5 6 or 7 and every 3 X 3 diagonal and antidiagonal sum not equal to 0 2 5 6 or 7.
A252509
Number of (n+2) X (3+2) 0..3 arrays with every 3 X 3 subblock row and column sum equal to 0 2 5 6 or 7 and every 3 X 3 diagonal and antidiagonal sum not equal to 0 2 5 6 or 7.
Terms
- a(0) =2055a(1) =3980a(2) =11476a(3) =28877a(4) =83016a(5) =252551a(6) =767176a(7) =2326656a(8) =7067545a(9) =21555438a(10) =65998872a(11) =202139805a(12) =619664176a(13) =1902757710a(14) =5844530563a(15) =17960909526a(16) =55236099834a(17) =169893963331a(18) =522684802558
External references
- oeis: A252509