Number of (n+2) X (5+2) 0..3 arrays with every 3 X 3 subblock row and column sum not 2 3 6 or 7 and every diagonal and antidiagonal sum 2 3 6 or 7.
A251891
Number of (n+2) X (5+2) 0..3 arrays with every 3 X 3 subblock row and column sum not 2 3 6 or 7 and every diagonal and antidiagonal sum 2 3 6 or 7.
Terms
- a(0) =1534a(1) =594a(2) =1260a(3) =1958a(4) =3530a(5) =6072a(6) =11762a(7) =21346a(8) =39202a(9) =80834a(10) =147842a(11) =276162a(12) =593666a(13) =1091074a(14) =2059522a(15) =4537346a(16) =8361986a(17) =15877122a(18) =35450882a(19) =65429506a(20) =124620802a(21) =280215554a(22) =517570562a(23) =987381762a(24) =2228158466a(25) =4117102594
External references
- oeis: A251891