Number of (n+2)X(2+2) 0..3 arrays with every 3X3 subblock row and column sum not equal to 0 3 5 6 or 8 and every 3X3 diagonal and antidiagonal sum equal to 0 3 5 6 or 8.
A252346
Number of (n+2)X(2+2) 0..3 arrays with every 3X3 subblock row and column sum not equal to 0 3 5 6 or 8 and every 3X3 diagonal and antidiagonal sum equal to 0 3 5 6 or 8.
Terms
- a(0) =798a(1) =1386a(2) =2864a(3) =5641a(4) =12419a(5) =29159a(6) =66229a(7) =155733a(8) =385341a(9) =923811a(10) =2260511a(11) =5786183a(12) =14416598a(13) =36175119a(14) =94631813a(15) =241864017a(16) =616201533a(17) =1632702189a(18) =4238564183a(19) =10892872784a(20) =29068257085a(21) =76152311742a(22) =196651024110
External references
- oeis: A252346