Number of (n+2)X(1+2) 0..3 arrays with every 3X3 subblock row and column sum equal to 1 3 4 6 or 7 and every 3X3 diagonal and antidiagonal sum not equal to 1 3 4 6 or 7.
A252203
Number of (n+2)X(1+2) 0..3 arrays with every 3X3 subblock row and column sum equal to 1 3 4 6 or 7 and every 3X3 diagonal and antidiagonal sum not equal to 1 3 4 6 or 7.
Terms
- a(0) =2680a(1) =4743a(2) =9312a(3) =19794a(4) =51024a(5) =125554a(6) =278710a(7) =763726a(8) =1944090a(9) =4393122a(10) =12184346a(11) =31155178a(12) =70732458a(13) =196510762a(14) =502312306a(15) =1143167546a(16) =3175587782a(17) =8108392378a(18) =18490987722a(19) =51342152722a(20) =130937041938a(21) =299194452074
External references
- oeis: A252203