Number of (n+2)X(3+2) 0..3 arrays with every 3X3 subblock row and diagonal sum equal to 0 3 4 6 or 7 and every 3X3 column and antidiagonal sum not equal to 0 3 4 6 or 7.
A252635
Number of (n+2)X(3+2) 0..3 arrays with every 3X3 subblock row and diagonal sum equal to 0 3 4 6 or 7 and every 3X3 column and antidiagonal sum not equal to 0 3 4 6 or 7.
Terms
- a(0) =1758a(1) =4026a(2) =12840a(3) =39492a(4) =145594a(5) =527688a(6) =1812508a(7) =7013991a(8) =27089549a(9) =99843027a(10) =396169255a(11) =1576927259a(12) =6006620761a(13) =24092395312a(14) =97158953094a(15) =375234161454
External references
- oeis: A252635