Number of (n+2)X(3+2) 0..3 arrays with every 3X3 subblock row and column sum unequal to 4 or 5 and every diagonal and antidiagonal sum equal to 4 or 5.
A251900
Number of (n+2)X(3+2) 0..3 arrays with every 3X3 subblock row and column sum unequal to 4 or 5 and every diagonal and antidiagonal sum equal to 4 or 5.
Terms
- a(0) =3312a(1) =1586a(2) =1536a(3) =2772a(4) =6408a(5) =10662a(6) =16848a(7) =35992a(8) =68496a(9) =124364a(10) =245836a(11) =470306a(12) =910476a(13) =1826136a(14) =3521588a(15) =6889776a(16) =13879176a(17) =27307258a(18) =53819940a(19) =107870152a(20) =214245840a(21) =425563680a(22) =851234568a(23) =1695933986a(24) =3381382444a(25) =6763588448
External references
- oeis: A251900