Number of (n+2)X(1+2) 0..3 arrays with every 3X3 subblock row and column sum not 2 4 5 or 7 and every diagonal and antidiagonal sum 2 4 5 or 7.
A251869
Number of (n+2)X(1+2) 0..3 arrays with every 3X3 subblock row and column sum not 2 4 5 or 7 and every diagonal and antidiagonal sum 2 4 5 or 7.
Terms
- a(0) =1038a(1) =2146a(2) =3092a(3) =5756a(4) =11008a(5) =18400a(6) =32372a(7) =60292a(8) =100612a(9) =176372a(10) =322532a(11) =547244a(12) =957412a(13) =1726428a(14) =2976676a(15) =5237036a(16) =9377508a(17) =16323580a(18) =28791476a(19) =51347308a(20) =90018580a(21) =159196860a(22) =283147012a(23) =498087484a(24) =881978324a(25) =1566542540a(26) =2762581684
External references
- oeis: A251869