Number of (n+2)X(4+2) 0..3 arrays with every 3X3 subblock row and column sum not equal to 0 2 4 6 or 7 and every 3X3 diagonal and antidiagonal sum equal to 0 2 4 6 or 7.

A252519

Number of (n+2)X(4+2) 0..3 arrays with every 3X3 subblock row and column sum not equal to 0 2 4 6 or 7 and every 3X3 diagonal and antidiagonal sum equal to 0 2 4 6 or 7.

Terms

    a(0) =660a(1) =1169a(2) =2818a(3) =5628a(4) =17804a(5) =47308a(6) =96659a(7) =310987a(8) =832766a(9) =1703099a(10) =5480317a(11) =14683957a(12) =30032974a(13) =96636432a(14) =258941110a(15) =529615317a(16) =1704112781a(17) =4566261438a(18) =9339439627a(19) =30050929581a(20) =80523123527a(21) =164695116796a(22) =529929039498

External references