Number of (n+2)X(2+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.
A251899
Number of (n+2)X(2+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) =2596a(1) =1548a(2) =1586a(3) =1962a(4) =3910a(5) =6744a(6) =9830a(7) =18590a(8) =34826a(9) =59814a(10) =108694a(11) =195918a(12) =357988a(13) =675680a(14) =1219152a(15) =2210766a(16) =4192704a(17) =7776562a(18) =14201302a(19) =26491586a(20) =49495812a(21) =91788030a(22) =170653566a(23) =317356866a(24) =591342258a(25) =1103205622a(26) =2051539582
External references
- oeis: A251899