Number of (n+2)X(2+2) 0..3 arrays with every 3X3 subblock row and column sum 1 3 6 or 8 and every diagonal and antidiagonal sum not 1 3 6 or 8.
A252009
Number of (n+2)X(2+2) 0..3 arrays with every 3X3 subblock row and column sum 1 3 6 or 8 and every diagonal and antidiagonal sum not 1 3 6 or 8.
Terms
- a(0) =1168a(1) =1602a(2) =1406a(3) =2002a(4) =3128a(5) =4570a(6) =6562a(7) =10980a(8) =18568a(9) =26866a(10) =47386a(11) =84660a(12) =122946a(13) =224610a(14) =409428a(15) =595934a(16) =1099500a(17) =2017128a(18) =2940062a(19) =5447180a(20) =10020972a(21) =14609852a(22) =27109394a(23) =49938584a(24) =72814596a(25) =135212590a(26) =249247170a(27) =363421408a(28) =675111432
External references
- oeis: A252009