Number of (n+1) X (1+1) 0..2 arrays with the minimum plus the upper median equal to the lower median plus the maximum in every 2 X 2 subblock.
A235877
Number of (n+1) X (1+1) 0..2 arrays with the minimum plus the upper median equal to the lower median plus the maximum in every 2 X 2 subblock.
Terms
- a(0) =21a(1) =51a(2) =129a(3) =339a(4) =921a(5) =2571a(6) =7329a(7) =21219a(8) =62121a(9) =183291a(10) =543729a(11) =1618899a(12) =4832121a(13) =14447211a(14) =43243329a(15) =129533379a(16) =388206921a(17) =1163834331a(18) =3489930129a(19) =10466644659a(20) =31393642521a(21) =94168344651a(22) =282479868129a(23) =847389272739
External references
- oeis: A235877