Number of (n+2)X(3+2) 0..3 arrays with every 3X3 subblock row and column sum not equal to 0 3 5 6 or 8 and every 3X3 diagonal and antidiagonal sum equal to 0 3 5 6 or 8.
A252347
Number of (n+2)X(3+2) 0..3 arrays with every 3X3 subblock row and column sum not equal to 0 3 5 6 or 8 and every 3X3 diagonal and antidiagonal sum equal to 0 3 5 6 or 8.
Terms
- a(0) =1331a(1) =2864a(2) =6986a(3) =15208a(4) =42345a(5) =111519a(6) =294801a(7) =852023a(8) =2391671a(9) =6526332a(10) =19388874a(11) =55236910a(12) =154718356a(13) =459605140a(14) =1324410518a(15) =3750331025a(16) =11134189835a(17) =32227560268a(18) =92034892492a(19) =272465735794a(20) =791324270153
External references
- oeis: A252347