Number of (n+2) X (4+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.
A252224
Number of (n+2) X (4+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) =1442a(1) =7724a(2) =24932a(3) =58334a(4) =160688a(5) =512822a(6) =1619714a(7) =4972874a(8) =15236172a(9) =46914228a(10) =144610766a(11) =445412672a(12) =1371485862a(13) =4223410850a(14) =13006666602a(15) =40055759564a(16) =123355278788a(17) =379883410622
External references
- oeis: A252224