T(n,k)=Number of (n+1)X(k+1) 0..2 arrays with the minimum plus the upper median equal to the lower median plus the maximum in every 2X2 subblock.
A235884
T(n,k)=Number of (n+1)X(k+1) 0..2 arrays with the minimum plus the upper median equal to the lower median plus the maximum in every 2X2 subblock.
Terms
- a(0) =21a(1) =51a(2) =51a(3) =129a(4) =105a(5) =129a(6) =339a(7) =231a(8) =231a(9) =339a(10) =921a(11) =537a(12) =453a(13) =537a(14) =921a(15) =2571a(16) =1311a(17) =951a(18) =951a(19) =1311a(20) =2571a(21) =7329a(22) =3345a(23) =2109a(24) =1833a(25) =2109a(26) =3345a(27) =7329a(28) =21219a(29) =8871
External references
- oeis: A235884