Number of (n+2)X(5+2) 0..3 arrays with every 3X3 subblock row and diagonal sum equal to 2 3 4 6 or 7 and every 3X3 column and antidiagonal sum not equal to 2 3 4 6 or 7.
A252404
Number of (n+2)X(5+2) 0..3 arrays with every 3X3 subblock row and diagonal sum equal to 2 3 4 6 or 7 and every 3X3 column and antidiagonal sum not equal to 2 3 4 6 or 7.
Terms
- a(0) =2689a(1) =2489a(2) =7425a(3) =21819a(4) =73925a(5) =249530a(6) =762761a(7) =2632409a(8) =8914507a(9) =27372795a(10) =94998346a(11) =322904419a(12) =993656452a(13) =3455998240a(14) =11770408787a(15) =36264169184a(16) =126262279153a(17) =430441032877
External references
- oeis: A252404